19,879
edits
Changes
→Example Calculations
===Example Calculations===
====Finding Potential Difference from Charge and Energy Transferred====
{| class="wikitable"
| style="height:20px; width: 300px; text-align:center;" |A '''charge''' of 84C transfers an [[energy]] of 20kJ. Calculate the [[Potential Difference|potential difference]] correct to two [[Significant Figures|significant figures]].
| style="height:20px; width: 300px; text-align:center;" |170J of [[energy]] is transferred by a '''charge''' of 92mC. Calculate the [[Potential Difference|potential difference]] correct to two [[Significant Figures|significant figures]].
|-
| style="height:20px; width: 300px; text-align:left;" |'''1. State the known quantities in correct [[unit]]s.'''
Q = 84C
E = 20kJ = 20x10<sup>3</sup>J
| style="height:20px; width: 300px; text-align:left;" |'''1. State the known quantities in correct [[unit]]s.'''
Q = 92mC = 92x10<sup>-3<sup>C
E = 170J
|-
| style="height:20px; width:200px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>V=\frac{E}{Q}</math>
<math>V=\frac{20 \times 10^3}{84}</math>
<math>V=238.0952V</math>
<math>V\approx 240V</math>
| style="height:20px; width:200px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>V=\frac{E}{Q}</math>
<math>V=\frac{170}{92 \times 10^{-3}}</math>
<math>V=1847.826V</math>
<math>V\approx = 1800V</math>
|}
====Finding Charge from Potential Difference and Energy Transferred====
{| class="wikitable"
<math>Q\approx1900C</math>
|}