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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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Resistance

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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Diode

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.




Thermistors

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…

Comments

Mist

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

Nowshin

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

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