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→Finding Power from Current and Resistance
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| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities in [[SI Unit]]s.'''
I = 1.4A
R = 9.1Ω
| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities in [[SI Unit]]s.'''
I = 31mA = 31x10<sup>-3</sup>A
R = 20kΩ = 20x10<sup>3</sup>
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| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>P = I^2R</math>
<math>P = 1.4^2 \times 9.1</math>
<math>P = 17.836W</math>
<math>P \approx 18W</math>
| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>P = I^2R</math>
<math>P = (31 \times 10^-3)^2 \times 20 \times 10^3</math>
<math>P = 19.22W</math>
<math>P \approx 19W</math>
|}
====Finding Power from Potential Difference and Resistance====