Electrical Power - Revision history

NRJC: /* Meaning */

2021-11-30T09:36:20Z

‎Meaning

Ellen References at 14:07, 5 December 2019

2019-12-05T14:07:34Z

Ellen References at 09:20, 19 November 2019

2019-11-19T09:20:53Z

NRJC at 13:48, 7 June 2019

2019-06-07T13:48:04Z

NRJC at 13:47, 7 June 2019

2019-06-07T13:47:57Z

NRJC at 13:47, 7 June 2019

2019-06-07T13:47:50Z

NRJC at 13:47, 7 June 2019

2019-06-07T13:47:41Z

NRJC at 15:02, 6 April 2019

2019-04-06T15:02:12Z

NRJC: /* Finding Power from Potential Difference and Resistance */

2019-03-02T23:23:41Z

‎Finding Power from Potential Difference and Resistance

NRJC at 23:23, 2 March 2019

2019-03-02T23:23:15Z

@@ Line 1: / Line 1: @@
 ==Key Stage 4==
 ===Meaning===
-'''Electrical power''' is the rate of [[Electrical Energy Transfer|electrical energy transfer]] in an [[Electrical Component|component]].
+'''Electrical power''' is the rate of [[Electrical Energy Transfer|electrical energy transfer]] in a [[Electrical Component|component]].
 ===About Electrical Power===

← Older revision		Revision as of 14:07, 5 December 2019
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	:[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/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 '']		:[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 '']

← Older revision		Revision as of 09:20, 19 November 2019
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	\|}		\|}
		+
		+	===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 '']

@@ Line 60: / Line 60: @@
 <math>P=\frac{V^2}{R}</math>
-Where:
+Where
 <math>P</math> = '''Electrical Power'''.

@@ Line 45: / Line 45: @@
 <math>P=I^2R</math>
-Where:
+Where
 <math>P</math> = '''Electrical Power'''.

@@ Line 30: / Line 30: @@
 <math>P=IV</math>
-Where:
+Where
 <math>P</math> = '''Electrical Power'''.

@@ Line 15: / Line 15: @@
 <math>P=\frac{W}{t}</math>
-Where:
+Where
 <math>P</math> = '''Electrical Power'''.

@@ Line 108: / Line 108: @@
 {| 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:center;" |A 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'''

@@ Line 197: / Line 197: @@
 | 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{V^2}{R}</math>
-<math>P=frac{6.8^2}{13}</math>
+<math>P=\frac{6.8^2}{13}</math>
 <math>P=3.5569W</math>
@@ Line 207: / Line 207: @@
 | 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{V^2}{R}</math>
-<math>P=frac{56^2}{20 \times 10^3}</math>
+<math>P=\frac{56^2}{20 \times 10^3}</math>
 <math>P=0.1568W</math>

@@ Line 146: / Line 146: @@
 {| class="wikitable"
 | style="height:20px; width:300px; text-align:center;" |A [[Electrical Bulb|bulb]] uses a [[Electrical Current|current]] of 1.4A and has a [[Electrical Resistance|resistance]] of 9.1Ω. Calculate the '''power''' of the [[Electrical Bulb|bulb]] correct to two [[Significant Figures|significant figures]].
-| style="height:20px; width:300px; text-align:center;" |A 20kΩ [[Electrical Resistor|resistor]] has a [[Electrical Current|current]] of 31mA. Calculate the '''power''' of the [[resistor]] correct to two [[Significant Figures|significant figures]].
+| style="height:20px; width:300px; text-align:center;" |A [[wire]] has a resistance of 15mΩ. Calculate the '''power''' dissipated by the [[wire]] when a [[Electrical Current|current]] of 3.5A is in the [[wire]] correct to two [[Significant Figures|significant figures]].
 |-
 | style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities in [[SI Unit]]s.'''
@@ Line 155: / Line 155: @@
 | style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities in [[SI Unit]]s.'''
-I = 31mA = 31x10<sup>-3</sup>A
+I = 3.5A
-R = 20kΩ = 20x10<sup>3</sup>
+R = 15mΩ = 15x10<sup>-3</sup>Ω
 |-
 | style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
@@ Line 172: / Line 172: @@
 <math>P = I^2R</math>
-<math>P = (31 \times 10^-3)^2 \times 20 \times 10^3</math>
+<math>P = (3.5)^2 \times 15 \times 10^-3</math>
-<math>P = 19.22W</math>
+<math>P = 0.18375W</math>
-<math>P \approx 19W</math>
+<math>P \approx 0.18W</math>
 |}
 ====Finding Power from Potential Difference and Resistance====
 {| class="wikitable"
-| style="height:20px; width:200px; text-align:center;" |A [[Potential Difference|potential difference]] is applied across a 98kΩ [[resistor]]. Calculate the '''power'''
+| style="height:20px; width:300px; text-align:center;" |A [[Potential Difference|potential difference]] of 6.8V is applied across a [[Electrical Bulb|bulb]] with a [[Electrical Resistance|resistance]] of 13Ω. Calculate the '''power''' of the [[Electrical Bulb]] correct to two [[Significant Figures|significant figures]].
-| style="height:20px; width:200px; text-align:center;" |Question
+| style="height:20px; width:300px; text-align:center;" |A 20kΩ [[Electrical Resistor|resistor]] has a [[Potential Difference|potential difference]] of 56V. Calculate the '''power''' dissipated by the [[resistor]] correct to two [[Significant Figures|significant figures]].
 |-
-| style="height:20px; width:200px; text-align:left;" |'''1. State the known quantities'''
+| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities in [[SI Unit]]s.'''
-| style="height:20px; width:200px; text-align:left;" |'''1. State the known quantities'''
 |-
-| style="height:20px; width:200px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
+| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
-| style="height:20px; width:200px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
 |}