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→Example Calculations
<math>I\approx8.5A</math>
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====Finding Potential Difference from Current and Resistance====
{| class="wikitable"
| style="height:20px; width: 300px; text-align:center;" |A '''current''' of 55mA flows through a [[Electrical Component|component]] with a [[Electrical Resistance|resistance]] of 93 Ohms. Calculate the [[Potential Difference|potential difference]] across this [[Electrical Component|component]] correct to two [[Significant Figures|significant figures]].
| style="height:20px; width: 300px; text-align:center;" |A 22kΩ [[Electrical Resistor|resistor]] has a '''current''' flowing through it of 6mA. Calculate the [[Potential Difference|potential difference]] across the [[Electrical Resistor|resistor]] correct to two [[Significant Figures|significant figures]].
|-
| style="height:20px; width: 300px; text-align:left;" |'''1. State the known quantities in correct [[unit]]s.'''
I = 55mA = 55x10<sup>-3</sup>A
R = 93Ω
| style="height:20px; width: 300px; text-align:left;" |'''1. State the known quantities in correct [[unit]]s.'''
I = 6mA = 6x10<sup>-3</sup>A
R = 22kΩ = 22x10<sup>3</sup>Ω
|-
| style="height:20px; width: 300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers and [[Evaluate (Maths)|evaluate]].'''
<math>R = \frac{V}{I}</math>
<math>93=\frac{V}{55 \times 10^{-3}}</math>
| style="height:20px; width: 300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers and [[Evaluate (Maths)|evaluate]].'''
<math>R = \frac{V}{I}</math>
<math>22 \times 10^3=\frac{V}{6 \times 10^{-3}}</math>
|-
| style="height:20px; width: 300px; text-align:left;" |'''3. [[Rearrange (Maths)|Rearrange]] the equation and [[Solve (Maths)|solve]].'''
<math>V= 55 \times 10^{-3} \times 93</math>
<math>V= 5.115V</math>
<math>V\approx5.1V</math>
| style="height:20px; width: 300px; text-align:left;" |'''3. [[Rearrange (Maths)|Rearrange]] the equation and [[Solve (Maths)|solve]].'''
<math>V= 6 \times 10^{-3} \times 22 \times 10^3</math>
<math>V= 132V</math>
<math>V\approx130V</math>
|}