Electricity

To calculate the resistance of a resistor.
(A resistor converts electrical energy into heat, see resistance of wires).

Firstly, we need to measure the current flowing through the resistor,
and the voltage across the resistor.

The circuit above shows where to place an ammeter and a voltmeter.

If the ammeter reads 2 A, and the voltmeter reads 6 V,

then   V = I x R

R = V ¸ I
    = 6 ¸ 2
         = 3 Ohms.

The same method can be used to calculate the resistance of any component.

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