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→Meaning
==Key Stage 4==
===Meaning===
'''Electrical power''' is the rate of [[Electrical Energy Transfer|electrical energy transfer]] in an a [[Electrical Component|component]].
===About Electrical Power===
<math>P=\frac{W}{t}</math>
Where:
<math>P</math> = '''Electrical Power'''.
<math>P=IV</math>
Where:
<math>P</math> = '''Electrical Power'''.
<math>P=I^2R</math>
Where:
<math>P</math> = '''Electrical Power'''.
<math>P=\frac{V^2}{R}</math>
Where:
<math>P</math> = '''Electrical Power'''.
{| class="wikitable"
| style="height:20px; width:300px; text-align:center;" |A light bulb is supplied a current of 625mA. The [[Potential Difference|potential difference]] across the terminals on the [[Electrical Bulb|light bulb]] is 96 [[volt]]s. Calculate the [[power]] of the [[Electrical Bulb|bulb]] correct to two [[Significant Figures|significant figures]].
| style="height:20px; width:300px; text-align:center;" |A [[Electrical Kettle|kettle]] is plugged into the [[Mains Electricity|mains supply]] which operates at 230V. It receives a current of 9.2Amps Calculate the power of the kettle correct to two [[Significant Figures|significant figures]].
|-
| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities in [[SI Unit]]s'''
| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>P=\frac{V^2}{R}</math>
<math>P=\frac{6.8^2}{13}</math>
<math>P=3.5569W</math>
| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
<math>P=\frac{V^2}{R}</math>
<math>P=\frac{56^2}{20 \times 10^3}</math>
<math>P=0.1568W</math>
|}
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Electrical power, pages 155, 174, GCSE Physics, Pearson Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Electrical power, pages 395, 408, GCSE Combined Science, Pearson Edexcel '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Electrical power, pages 114-115, Gateway GCSE Physics, Oxford, OCR '']