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AY is not teaching this course in 2022-
AY is not teaching this course in 2022-
NOT UPDATED FOR 2022
NOT UPDATED FOR 2022
Science Achievement Standard 90941
Science Achievement Standard 90941
Science 1.2 - Investigate implications of electricity and magnetism for everyday life
Science 1.2 - Investigate implications of electricity and magnetism for everyday life
This standard is about how using multiple appliances in one plug can be a safety hazard, by looking at the impact of plugging additional appliances into the same circuit.
In other words: how current varies in a household power socket for different combinations of appliances.
People often use adapters to plug several appliances into the same power socket.
This assessment activity requires you to investigate and explain under what conditions plugging multiple appliances into the same power socket would be dangerous.
Assessment Doc
Assessment Doc
You have been shared a copy in your L1Sci Folder on Drive
Assessment Timeline:
Assessment Timeline:
The assessment is worth 4 Credits
DUE: Last day of Term 1.
Electricity Internal Student Version
Learn
Learn
The first week we will be learning the content required for this internal.
Recap Year 10 electricity. Relearning circuit symbols and series and parallel circuits. If you have your year 10 SciPad then I highly suggest you have a look through that!
Series and Parallel Circuits Recap:
Series and Parallel Circuits Recap:
Wherever you are taking notes make sure you write down the similarities and differences between a series and parallel circuit. Specifically looking at how current and voltage is affected.
Voltage:
Voltage:
Measures how much energy the current is carrying, measured in volts (v).
In Series- the voltage is shared (divided) between the components.
In Parallel- the voltage stay the same for all components (everywhere in the circuit).
Make a copy of the doc and fill it out.
Current:
Current:
Measures the flow of electrons in a circuit, is measured in amps (A).
In Series- the current is the same everywhere in the circuit.
In Parallel- the current is shared among the branches (sum of branches = current of main part)
Resistance
Resistance
A resistor is something which is put in to a circuit to slow the movement of electrons. The heating effect in a wire depends on the resistance. Increasing the total resistance will cool a circuit and decreasing resistance will heat a circuit.
Resistance is measured in Ohms (Ω )
Adding resistance in series:
This will increase the total resistance of the circuit which will lower the current for a given voltage, hence lowering the heat of the circuit.
Total resistance is the sum of each resistance in a series circuit.
Adding resistance in parallel:
This will decrease the total resistance of the circuit, which increases the current for a given voltage, hence increasing the heat of the circuit.
Total resistance is a bit more complicated to calculate in a parallel circuit:
Ohm's Law
Ohm's Law
Ohm's Law shows the relationship between Voltage, current and resistance.
Voltage= Current x Resistance
V=IR
When the same voltage is supplied. Resistance is inversely proportional to current. This means as current goes up, resistance goes down.
Safety Features
Safety Features
The use of fuses or circuit breakers in circuits:
Fuses and circuit breakers are used as a safety feature to ensure if the circuit gets too hot, it doesn't catch on fire. The fuse/ circuit breaker will break the circuit, stopping the flow of electrons and instantly cooling the circuit.
A fuse is set to withstand a certain current, if that current is exceeded to fuse will break and stop the current.
CREATE
CREATE
You will be using the PHET website to create circuits demonstrating what happens to voltage and current, when different circuit types and components are used.
SHARE
SHARE
The Investigation:
The Investigation:
Your data should allow you to determine:
· How the current in the different parts of the circuit changes as each additional appliance (resistor) is plugged in. What do you use to measure current - how do you connect it?
· How the voltage across the components in the circuit changes. What do you use to measure voltage - how do you connect it?
· Whether it matters in which order you connect the appliances (resistors)
· Which combinations of one, two, or three appliances are safer than others if the temperature of the wall wires depends on the current flowing through them. How do we keep our wiring safe at home?
The Report
The Report
Explain the impact that plugging additional appliances into the same circuit will have on everyday life.
In your report, make sure you:
· Make appropriate inferences from the data about safety. For example, you could explain under what circumstances you might expect that plugging an additional appliance will or will not be dangerous
· Link the data you have gathered to scientific theory you have been taught in class (Ohms Law).
· Suggest a safety feature that could be built into the circuits of a house to prevent accidents from happening, where the feature should be connected, and how it might work.
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