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Electricity

To calculate the resistance of a resistor.
(A resistor converts electrical energy into heat, it is like a little heater).

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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