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P2 Topic 2: Controlling and using electric currents
Electric current and potential difference

1. Current: is the rate of flow of charge around the circuit. Current will only flow through a component if there
is a voltage across that compound. It is measured in Amperes, A.
2. Voltage/potential difference: is…

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The Ammeter: This measures the current flowing
along the component. It must be placed in series.
The Voltmeter: This measures the voltage or
potential difference across the component. It
must be placed parallel around the component
under test ­ not around the variable resistor of
the cell.

The Relationship…

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Current will only flow in one direction in a diode.

Light dependent resistors

These are a special type of resistor that changes its resistance depending on how much light there is.
o In bright light, resistance falls.
o In darkness, the resistance is the highest.


These are similar…

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An appliance with a high power rating transfers a lot energy in a short time.
The energy comes from the current running through it. This means an appliance with a high power rating will
draw a large current from its supply.
Power is measured in watts. The formula for electrical…




hi, do you have any chemistry notes for c1 ,c2, c3



Do you have any chemistry notes for edexcel c1,c2, and c3?

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