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→Example Calculations
<math>t = 5.0 \times 10^{-4}s</math>
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====Finding Current from Potential Difference and Resistance====
{| class="wikitable"
| style="height:20px; width:300px; text-align:center;" |A [[Potential Difference|potential difference]] of 9.9V is placed across an 18 Ohm [[Electrical Resistor|resistor]]. Calculate the '''current''' flowing through the [[Electrical Resistor|resistor]] correct to two [[Significant Figures|significant figures]].
| style="height:20px; width:300px; text-align:center;" |A toaster has a [[Electrical Resistance|resistance]] of 27 Ohms is plugged into the [[Mains Electricity|mains]] which has a [[Potential Difference|potential difference]] of 230V. Calculate the current flowing through the toaster correct to two [[Significant Figures|significant figures]].
|-
| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities'''
V = 9.9V
R = 18Ω
| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities'''
V = 230V
R = 27Ω
|-
| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>I=\frac{V}{R}</math>
<math>I=\frac{9.9}{18}</math>
<math>I=0.55A</math>
| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>I=\frac{V}{R}</math>
<math>I=\frac{230}{27}</math>
<math>I=8.519A</math>
<math>I\approx8.5A</math>
|}