P2 - Current through different circuits

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Current and Potential Difference

Circuit containing:

Current - measured by an ammeter - in series

Potential Difference - measured by a voltmeter - parallel

Fixed resistor - has a value that doesn't change

In this circuit the temperature is constant

For this circuit, current is directly proportional to the potential difference - on a graph the line is a straight line

To work out potential difference you use this equation:

V = I x R

V - volts, I - amps, R - ohms

Current Through Lamps and Diodes

Circuit containing a lamp

On a graph…


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