Embedded Files
Introduction
Introduction
Electricity is used every day in the home, and in battery operated devices with integral circuits. In this topic you will learn how to draw electric circuits, how to measure current and potential difference, and how to calculate the resistance of components in common circuits. You will also investigate the difference between series and parallel circuits, and how current and potential difference behaves in these circuits. Finally, you will investigate static electricity.
Task 1: Know
Task 1: Know
Use look, cover, write check to learn the answers to the core questions and the keywords for this topic
Learn
Learn
Task 2: How do we draw circuits?
Task 2: How do we draw circuits?
Task 2c: Make notes that:
Explain why we use standard circuit symbols when drawing circuits
Define component
Explain (with a diagram) how to connect an ammeter to measure the current in a circuit
Explain (with a diagram) how to connect a voltmeter to measure the potential difference in a circuit
Define a series circuit
Define a parallel circuit
Task 2d: Draw circuit diagrams for the following:
Series circuit: One cell, one lamp, 1 switch
Series circuit: One cell, two lamps and an ammeter. Now add a voltmeter across one lamp
Parallel circuit: Two cells (or a battery made up of 2 cells), 2 lamps in parallel, and a switch
Task 2e: Complete the worksheet on problems with circuits
Task 3: What is Potential Difference?
Task 3: What is Potential Difference?
Task 3c: Open the Phet Animation to make your own circuits: Click on the link, then choose ‘Intro’ NOT lab
Using the worksheet provided, practise building the circuits listed in the Phet animation.
For each circuit, draw a circuit diagram in your book, using a pencil and ruler to keep them neat.
Use the voltmeter in the Phet animation to measure the potential difference where needed, and record your results
What do you notice about the potential difference in the different circuits?
Try your own variations for building circuits. Draw two of them, and record the potential difference of the cell (or battery) and a component
Explain how to make a bulb brighter, and dimmer.
Task 4: What is Current?
Task 4: What is Current?
Task 4b: Watch the video
current.wmvTask 4c: Make notes that:
Define current
Describe two things that are needed in order for current to flow through a circuit
State what unit is used to measure current
Name the component used to measure current and explain why it needs to be connected in series.
Task 4d: Answer and self mark the exam questions
Task 5: Current and PD in series circuits
Task 5: Current and PD in series circuits
Task 5b: Watch the video
Task 5c: Make notes that:
Describe how current behaves in a series circuit. Explain why this happens.
Describe how potential difference behaves in a series circuit. Explain why this happens
Copy the diagram on the right
Describe and explain what would happen to the current and potential difference in this ciruit if:
One bulb was removed from the series circuit
An extra bulb was added to the series circuit
An extra cell was added to the series circuit
Task 6: Current and PD in parallel circuits
Task 6: Current and PD in parallel circuits
Task 6d: Complete and self mark the exam questions
Task 7: Resistance
Task 7: Resistance
Task 7b: Make notes that:
Define resistance
Give the unit and symbol of resistance
Draw the symbol for a fixed resistor (that has a fixed resistance) and the symbol for a variable resistor (where the resistance can be changed)
Define conductor and insulator
Task 7c: Open the Phet animation and choose ‘Intro’ not lab. Open the worksheet on resistance
Follow the instructions in the worksheet and take the readings needed to fill the table
Scroll through the components in the Phet animation, and try using some unusual ‘components’ like the pencil, the dog, and the dollar bill. List which items are insulators and which are conductors.
Task 7d: Calculations
Give the formula for Resistance
Use the formula to calculate the resistance of the following bulbs:
A bulb with a PD of 1.5V accross it with a current of 1A flowing through it.
A bulb with a PD of 1.5V accross it with a current of 0.5A flowing through it.
A bulb with a PD of 3V accross it with a current of 1A flowing through it.
A bulb with a PD of 3V accross it with a current of 0.5A flowing through it.
Click on the arrow to check your answers
Click on the arrow to check your answers
1.5Ω
3Ω
3Ω
6Ω
Task 8: Static electricity
Task 8: Static electricity
Task 8a: Watch the videos:
Task 8c: Make notes that:
Define static electricity
Give the charge of electrons
Explain how charge builds up
Define the rules for attraction and repulsion in charged particles
Explain why a person’s hair stands up when they touch a Van der Graaf generator
Task 8d: Complete the wordfill in your books:
Overall charge of an object can be ________ or ________.
Opposite charges _______ and ____ charges repel.
______ charges can be made by friction.
Electrons are _________ charged
Removal of _________ leave an object with a ________ charge.
________ of electrons leave an object with ________ charge
Task 8e: Practical time
There are 3 practical experiments listed in the slides - you can try them at home, or try the following ones. Record your findings in your book.
Ballon: charge an inflated balloon by rubbing it against your hair. Now hold it over some small squares of tissue paper. Describe and draw what happened. Can you explain this scientifically?
Balloon again: charge the inflated balloon by rubbing it briskly against your hair. Now run a tap, with a very small flow of water running from the tap. Hold the charged balloon close to, but not touching, the spout of water. Describe and draw what happened. Can you explain this scientifically?
If you have a perspex rod, and a plastic ruler - charge it by briskly rubbing it with a duster cloth (or use the inflated balloon again). Now hold it above some small squares of tissue paper. Describe and draw what happens. Can you explain this scientifically?
Task 9: Summary
Task 9: Summary
Task 9a: Complete the Seneca learning units for this topic
Task 9b: Go through the BBC Bitesize information on this topic
Task 9c: Make a set of revision resources - a mind map or revision cards - to summarise your work on this topic and put it in your revision folder.
Task 10: Check
Task 10: Check
Complete the quiz to make sure you understand this unit.
Report abuse