P5 - Circuits - Current and Power

Current

Electric current is the flow of charge (electrons). A battery pushes charge around a circuit - the charge is never used up by any component.

Current depends on Voltage and Resistance!

Current will only flow through a component if there's a voltage across that component.

Voltage is the 'driving force' that pushes the current around - it's measured in Volts (V)

Resistance is caused by things in a circuit, components etc., that resist the flow of charge (slow the charge down).

The relative sizes of the voltage and resistance will determine how big the current will be.

 Power

Power is the rate of energy transfer!

Anything that supplies electricity is also supplying energy

So…