Electrical Energy and Power

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Last updated 4:58 PM on 7/20/26
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6 Terms

1
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Power in circuits equation 1

P = VI

<p>P = VI</p>
2
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Power in circuits equation 2

P = I2R

<p>P = I<sup>2</sup>R</p>
3
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Power in circuits equation 3

P = V2/R

<p>P = V<sup>2</sup>/R</p>
4
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Work done in a circuit equation

= VIt

<p>= VIt</p>
5
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Experiment to investigate the power output of a motor

1- Attach a mass to a motor and connect the motor to a circuit. Close the switch so the motor will turn on, winding the string around the axle and raising the mass

2- Record the time taken for the motor to raise the mass a set distance using a stopwatch and metre ruler

3- Calculate work done against gravity with ΔEgrav= mgΔh, then find power with P = W/t

6
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How to find the efficiency of a motor with a known power

Measure the potential difference across the motor and the current through it to find the input power with P=IV, then find efficiency with useful power output/total power input