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Electricity

To calculate the power of a lamp.

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

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   P = V x I
              = 6 x 2
                      = 12 Watts.

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

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Copyright © 2008 Dr. Colin France. All Rights Reserved.