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Current, voltage and resistance
Current, voltage and resistance
Read and translate the text.
Read and translate the text.
The extent to which a wire resists the flow of current is called resistance, and is measured in ohms.
The extent to which a wire resists the flow of current is called resistance, and is measured in ohms.
Thin wires conduct less easily than thick ones, because there is less room for the electrons to travel through.
Thin wires conduct less easily than thick ones, because there is less room for the electrons to travel through.
The energy needed to push current through a resistance is transformed into heat. This can be useful, for example in the very thin filament of a light bulb, which glows white hot.
The energy needed to push current through a resistance is transformed into heat. This can be useful, for example in the very thin filament of a light bulb, which glows white hot.
However, a component with a high current consumption must not be connected using wires which are too thin, or the wires will overheat, blow a fuse, or burn out.
However, a component with a high current consumption must not be connected using wires which are too thin, or the wires will overheat, blow a fuse, or burn out.
All the electrical units of measurement are interrelated: a pressure of 1 volt causes a current of 1 amp to flow through a resistance of 1 ohm. Volts divided by ohms equal amps. For example, a light bulb with a resistance of 3 ohms, in a 12 volt system, consumes 4 amps.
All the electrical units of measurement are interrelated: a pressure of 1 volt causes a current of 1 amp to flow through a resistance of 1 ohm. Volts divided by ohms equal amps. For example, a light bulb with a resistance of 3 ohms, in a 12 volt system, consumes 4 amps.
This means it must be connected using wires thick enough to carry 4 amps comfortably.
This means it must be connected using wires thick enough to carry 4 amps comfortably.
Often the power consumption of a component will be stated in watts, which are found by multiplying amps and volts. The lamp in the example consumes 48 watts.
Often the power consumption of a component will be stated in watts, which are found by multiplying amps and volts. The lamp in the example consumes 48 watts.
Match the words in bold with the definition. Please click on following link:
Match the words in bold with the definition. Please click on following link:
Try it again by clicking on following link:
Try it again by clicking on following link:
Write correct names of car electrical parts. Please click on following link:
Write correct names of car electrical parts. Please click on following link:
PLAY and LEARN new words. Please click on following links:
PLAY and LEARN new words. Please click on following links:
Electrical circuits
Electrical circuits
Please fill the blanks with the words below:
Please fill the blanks with the words below:
Devices, different, broader, picture, quickly, supply, circuit diagram, stripe, already, relays, horizontal, abbreviations, standards, cross-sectional, troubleshooting, publishers, created, installing, manufacturers, labels, battery, addition, primary
Devices, different, broader, picture, quickly, supply, circuit diagram, stripe, already, relays, horizontal, abbreviations, standards, cross-sectional, troubleshooting, publishers, created, installing, manufacturers, labels, battery, addition, primary
The ability to read _______________ plays a central role in ____________ and __________ accessories. However, the diagrams of ___________car ____________or publishers differ quite a lot from each other. The diagrams needs to be made clear ______________ at the beginning of the troubleshooting. Only in this way can a whole _________ of the previously unknown system and its parts be ___________.
The ability to read _______________ plays a central role in ____________ and __________ accessories. However, the diagrams of ___________car ____________or publishers differ quite a lot from each other. The diagrams needs to be made clear ______________ at the beginning of the troubleshooting. Only in this way can a whole _________ of the previously unknown system and its parts be ___________.
There are several _________for circuit diagrams and terminal ___________. But car manufacturers often tend to use signs and symbols in their repair manual diagrams - more or less. However, DIN is used in a __________ way (Deutsche Institute fĂĽr Normung standards). German and other European _________ use German standards.
There are several _________for circuit diagrams and terminal ___________. But car manufacturers often tend to use signs and symbols in their repair manual diagrams - more or less. However, DIN is used in a __________ way (Deutsche Institute fĂĽr Normung standards). German and other European _________ use German standards.
According to DIN, the ____________ is provided with a plus and a minus, and a power ______from the ignition lock, as ___________lines at the top and bottom of the circuit. It allows you to read the diagram easily and______________.
According to DIN, the ____________ is provided with a plus and a minus, and a power ______from the ignition lock, as ___________lines at the top and bottom of the circuit. It allows you to read the diagram easily and______________.
Terminal markers are dealt with in DIN 72552. In ________________ to electrical circuits, the same symbols are applied to _________, switches and other ________________.
Terminal markers are dealt with in DIN 72552. In ________________ to electrical circuits, the same symbols are applied to _________, switches and other ________________.
Wire markings are generally represented as _________________. The two and more colors are marked so that the ______________ color is given first, followed by the color of the __________(the following stripe colors). The number indicates the ______________ area of the wire (mm²).
Wire markings are generally represented as _________________. The two and more colors are marked so that the ______________ color is given first, followed by the color of the __________(the following stripe colors). The number indicates the ______________ area of the wire (mm²).
Read the dialogue and insert the missing answers.
Read the dialogue and insert the missing answers.
- A fuse did not blow because there was enough resistance in the circuits being energized, so the current (in amperes) was too low to blow any fuses.
- A fuse did not blow because there was enough resistance in the circuits being energized, so the current (in amperes) was too low to blow any fuses.
- Dash light and side marker lights would light.
- Dash light and side marker lights would light.
- I will repair the fire and fix the exhaust leak.
- I will repair the fire and fix the exhaust leak.
- Small hole in tailpipe (after the muffler) directs hot exhaust gases to wiring harness containing all of wires for circuits at rear of the car. The heat has melted the insulation and caused most of the wires to touch. Whenever one circuit was activated (such as when the brake pedal was applied), the current had a complete path to several other circuits.
- Small hole in tailpipe (after the muffler) directs hot exhaust gases to wiring harness containing all of wires for circuits at rear of the car. The heat has melted the insulation and caused most of the wires to touch. Whenever one circuit was activated (such as when the brake pedal was applied), the current had a complete path to several other circuits.
- Yes, The problem is near the exhaust system.
- Yes, The problem is near the exhaust system.
- Also the turn signals cause all the lights to blink and the fuel gauge needle to bounce up and down.
- Also the turn signals cause all the lights to blink and the fuel gauge needle to bounce up and down.
- Yes, actually when break lights are on, the front parking light also comes on.
- Yes, actually when break lights are on, the front parking light also comes on.
A customer comes to car shop with complaints about the cars lights were doing strange things when the break pedal was depressed.
A customer comes to car shop with complaints about the cars lights were doing strange things when the break pedal was depressed.
Customer: Hello! Do you have a minute?
Customer: Hello! Do you have a minute?
Technician: Sure. What is it?
Technician: Sure. What is it?
Customer: Something is wrong with the lights of my car. They are doing strange things when I depress the break pedal.
Customer: Something is wrong with the lights of my car. They are doing strange things when I depress the break pedal.
Technician: What exactly is happening when you depress the break pedal?
Technician: What exactly is happening when you depress the break pedal?
Customer: __________________________________________________
Customer: __________________________________________________
Technician: Is that all? Or is there anything else?
Technician: Is that all? Or is there anything else?
Customer: __________________________________________________
Customer: __________________________________________________
Technician: That is really weird. Any other problems?
Technician: That is really weird. Any other problems?
Customer: ____________________________________________________
Customer: ____________________________________________________
Technician: Oh I see. Let me take a look. Using a single-filament bulb in the place of a dual-filament bulb can also cause many of these same problems. But because most of the trouble seems to occur when the brake pedal was depressed, I am going to to trace all the wires in the brake light circuit.
Technician: Oh I see. Let me take a look. Using a single-filament bulb in the place of a dual-filament bulb can also cause many of these same problems. But because most of the trouble seems to occur when the brake pedal was depressed, I am going to to trace all the wires in the brake light circuit.
Customer: Oh thanks . (after short while) Can you see whats wrong?
Customer: Oh thanks . (after short while) Can you see whats wrong?
Technician: __________________________________________________________________________
Technician: __________________________________________________________________________
Customer: Whats wrong there exactly?
Customer: Whats wrong there exactly?
Technician: ___________________________________________________________________________
Technician: ___________________________________________________________________________
Customer: How come the fuse did not blow?
Customer: How come the fuse did not blow?
Technician: ___________________________________________________________________________
Technician: ___________________________________________________________________________
Customer: That's good to know. How can you fix it?
Customer: That's good to know. How can you fix it?
Technician: ___________________________________________________________________________
Technician: ___________________________________________________________________________
Customer: Thank you so much. I feel way more at ease now
Customer: Thank you so much. I feel way more at ease now
Technician: You are welcome. I will let you know when I am done.
Technician: You are welcome. I will let you know when I am done.
Group work: research on Internet opportunities for technicians who specialize in electrical systems. Focus on following questions:
Group work: research on Internet opportunities for technicians who specialize in electrical systems. Focus on following questions:
1. What types of work are available?
1. What types of work are available?
2. What are the training and job qualification requirements?
2. What are the training and job qualification requirements?
3. What is salary range for technician who is trained in automotive electrical systems?
3. What is salary range for technician who is trained in automotive electrical systems?
Write a summary of your findings, and make a Power Point presentation.
Write a summary of your findings, and make a Power Point presentation.
Automotive wiring
Automotive wiring
Find a partner. Read one passage quickly and try to remember as much as you can. After that cover the text and try to re-tell it to your partner.
Find a partner. Read one passage quickly and try to remember as much as you can. After that cover the text and try to re-tell it to your partner.
1. Body grounding
1. Body grounding
All lights and accessories ground to the body of the vehicle. Body ground wires such as this one are needed to conduct all of the current from these components back to the negative terminal of the battery. Body ground wire connects body to engine. Most battery negative cables attach to engine
All lights and accessories ground to the body of the vehicle. Body ground wires such as this one are needed to conduct all of the current from these components back to the negative terminal of the battery. Body ground wire connects body to engine. Most battery negative cables attach to engine
2. Battery
2. Battery
Battery cables are designed to carry heavy starter current and are therefore usually 4 gauge or larger wire. Note that usually battery has a thermal blanket covering to help protect the battery from high underhood temperatures. The wiring is also covered with plastic conduit called split loom tubing.
Battery cables are designed to carry heavy starter current and are therefore usually 4 gauge or larger wire. Note that usually battery has a thermal blanket covering to help protect the battery from high underhood temperatures. The wiring is also covered with plastic conduit called split loom tubing.
3. Testing fuse
3. Testing fuse
To test a fuse, use a test light to check for power at power side of fuse. The ignition switch and lights may have to be on before some fuses receive power. If fuse is good, test light should light on both sides (power side & load side) of fuse .
To test a fuse, use a test light to check for power at power side of fuse. The ignition switch and lights may have to be on before some fuses receive power. If fuse is good, test light should light on both sides (power side & load side) of fuse .
4. Circuit breaker
4. Circuit breaker
Typical blade circuit breaker fits into the same space as a blade fuse. If excessive current flows through the bimetallic strip, the strip bends and opens the contacts and stops current flow. When the circuit breaker cools, the contacts close again, completing the electrical circuit.
Typical blade circuit breaker fits into the same space as a blade fuse. If excessive current flows through the bimetallic strip, the strip bends and opens the contacts and stops current flow. When the circuit breaker cools, the contacts close again, completing the electrical circuit.
5. Circuit protector
5. Circuit protector
When current exceeds the amperage rating of PTC circuit protector, the polymer material that makes up electronic circuit protector increases in resistance. As shown, a high-resistance electrical path still exists even though motor will stop operating as a result of the very low current flow through very high resistance. Circuit protector will not reset/cool down until voltage removed from circuit.
When current exceeds the amperage rating of PTC circuit protector, the polymer material that makes up electronic circuit protector increases in resistance. As shown, a high-resistance electrical path still exists even though motor will stop operating as a result of the very low current flow through very high resistance. Circuit protector will not reset/cool down until voltage removed from circuit.
6. Fusible links
6. Fusible links
Fusible links are usually located close to battery and are usually attached to a junction block. Notice that they are only 15 to 23 cm long and feed more than one fuse from each fusible link.
Fusible links are usually located close to battery and are usually attached to a junction block. Notice that they are only 15 to 23 cm long and feed more than one fuse from each fusible link.
Read and translate the text.
Read and translate the text.
Why is there a ground strap on my exhaust system? The ground strap is only there to dissipate static electricity. Static electricity is created when the flow of the exhaust gases travels through the system. Using a ground strap connected to the exhaust system helps prevent static charge from building up, which could cause a spark to jump to the body or frame of the vehicle.
Why is there a ground strap on my exhaust system? The ground strap is only there to dissipate static electricity. Static electricity is created when the flow of the exhaust gases travels through the system. Using a ground strap connected to the exhaust system helps prevent static charge from building up, which could cause a spark to jump to the body or frame of the vehicle.
If a vehicle is equipped with a ground strap, be sure that it is connected at both ends to help ensure long exhaust system life. If static electricity is allowed to discharge from the exhaust system to the body or frame of the vehicle, the resulting arcing points can cause rust or corrosion, shortening the life of the exhaust system. If a new exhaust system is installed, be sure to reattach the ground strap.
If a vehicle is equipped with a ground strap, be sure that it is connected at both ends to help ensure long exhaust system life. If static electricity is allowed to discharge from the exhaust system to the body or frame of the vehicle, the resulting arcing points can cause rust or corrosion, shortening the life of the exhaust system. If a new exhaust system is installed, be sure to reattach the ground strap.
Most vehicles also use a ground strap connected to the fuel filler tube for the same reason.
Most vehicles also use a ground strap connected to the fuel filler tube for the same reason.
Match the words in bold with the definition. Please click on following link:
Match the words in bold with the definition. Please click on following link:
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