Electrical Resistance - Revision history

Ellen References at 17:07, 12 November 2019

2019-11-12T17:07:58Z

NRJC: /* Equation */

2019-06-07T10:06:41Z

‎Equation

NRJC at 10:06, 7 June 2019

2019-06-07T10:06:20Z

NRJC: /* Equation */

2019-06-07T10:06:03Z

‎Equation

NRJC: /* Equation */

2019-06-07T10:05:36Z

‎Equation

NRJC at 12:47, 8 April 2019

2019-04-08T12:47:37Z

NRJC: /* About Resistance */

2019-02-25T19:25:05Z

‎About Resistance

NRJC: /* About Resistance */

2019-02-25T19:24:42Z

‎About Resistance

NRJC: /* Key Stage 4 */

2019-02-25T19:24:19Z

‎Key Stage 4

NRJC: /* Example Calculations */

2019-02-25T19:01:01Z

‎Example Calculations

← Older revision		Revision as of 17:07, 12 November 2019
Line 215:		Line 215:
	<math>V\approx130V</math>		<math>V\approx130V</math>
	\|}		\|}
		+
		+	===References===
		+	====AQA====
		+
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical), page 63, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical), page 65, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10246 ''Resistance (electrical), pages 180-184, GCSE Combined Science; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac384 ''Resistance (electrical), pages 24-30, 32, GCSE Physics; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10247 ''Resistance (electrical); in parallel circuits, pages 186, 187, GCSE Combined Science; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac385 ''Resistance (electrical); in parallel circuits, pages 29, 30, GCSE Physics; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); in parallel, pages 74, 77-79, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); in parallel, pages 76, 79-81, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10248 ''Resistance (electrical); in series circuits, pages 185, 187, GCSE Combined Science; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac386 ''Resistance (electrical); in series circuits, pages 28, 30, GCSE Physics; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); in series, pages 70, 77, 78, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); in series, pages 72, 79, 80, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); investigating, pages 64, 77-79, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); investigating, pages 66, 79-81, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); of diodes, page 66, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); of diodes, page 68, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); of filament lamps, page 66, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); of filament lamps, page 68, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); of LDRs, page 80, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); of LDRs, page 82, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); of resistors, pages 65, 66, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); of resistors, pages 67, 68, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Resistance (electrical); of thermistors, pages 80, 81, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Resistance (electrical); of thermistors, pages 82, 83, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10249 ''Resistance (electrical); wire length, page 182, GCSE Combined Science; The Revision Guide, CGP, AQA '']

@@ Line 82: / Line 82: @@
 <math>R = \frac{V}{I}</math>
-Where:
+Where
 <math>R</math> = '''Resistance''' of a [[Electrical Component|component]].

@@ Line 80: / Line 80: @@
 '''Resistance''' = (Potential Difference)/(Current)
-:<math>R = \frac{V}{I}</math>
+<math>R = \frac{V}{I}</math>
 Where:
-: <math>R</math> = '''Resistance''' of a [[Electrical Component|component]].
-: <math>V</math> = The [[Potential Difference]] across the [[Electrical Component|component]].
+<math>R</math> = '''Resistance''' of a [[Electrical Component|component]].
-: <math>I</math> = The [[Electrical Current|current]] through the [[Electrical Component|component]].
 ===Example Calculations===

@@ Line 12: / Line 12: @@
 <math>R = \frac{V}{I}</math>
 Where
 <math>R</math> = '''Resistance''' of a [[Electrical Component|component]].
 <math>V</math> = The [[Potential Difference]] across the [[Electrical Component|component]].
 <math>I</math> = The [[Electrical Current|current]] through the [[Electrical Component|component]].

@@ Line 11: / Line 11: @@
 '''Resistance''' = (Potential Difference)/(Current)
-:<math>R = \frac{V}{I}</math>
+<math>R = \frac{V}{I}</math>
-Where:
+Where
-: <math>R</math> = '''Resistance''' of a [[Electrical Component|component]].
+<math>R</math> = '''Resistance''' of a [[Electrical Component|component]].
-: <math>V</math> = The [[Potential Difference]] across the [[Electrical Component|component]].
+<math>V</math> = The [[Potential Difference]] across the [[Electrical Component|component]].
-: <math>I</math> = The [[Electrical Current|current]] through the [[Electrical Component|component]].
+<math>I</math> = The [[Electrical Current|current]] through the [[Electrical Component|component]].
 ===Example Calculations===

@@ Line 37: / Line 37: @@
 Potential Difference = 12V
-Current = 200[[mA]] = 0.2A
+Current = 200mA = 0.2A
 <math>R = \frac{V}{I}</math>

@@ Line 71: / Line 71: @@
 | style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows [[electron]]s moving past the [[Positive Ion|positive ions]] in a [[metal]] [[lattice]]. As they move some of them collide with the [[Positive Ion|positive ions]] in the [[lattice]] which is acts as a '''resistance''' to an [[Electrical Current|electrical current]].
 |}
-: The higher the [[temperature]] of a [[Electrical Conductor|conductor]] the higher the '''resistance''' of that [[Electrical Conductor|conductor]]. This is due to the [[metal]] [[ion]]s vibrating faster at higher [[temperature]]s which makes [[electron]]s more likely to collide with the [[ion]]s as they pass through the [[Electrical Conductor|conductor]].
+: The higher the [[temperature]] of a [[Electrical Conductor|conductor]] the greater the '''resistance''' of that [[Electrical Conductor|conductor]]. This is due to the [[metal]] [[ion]]s vibrating faster at higher [[temperature]]s which makes [[electron]]s more likely to collide with the [[ion]]s as they pass through the [[Electrical Conductor|conductor]].
 ===Equation===

@@ Line 67: / Line 67: @@
 {| class="wikitable"
 |-
-|[[File:Picture.png|center|500px]]
+|[[File:ResistanceCause.png|center|500px]]
 |-
 | style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows [[electron]]s moving past the [[Positive Ion|positive ions]] in a [[metal]] [[lattice]]. As they move some of them collide with the [[Positive Ion|positive ions]] in the [[lattice]] which is acts as a '''resistance''' to an [[Electrical Current|electrical current]].

@@ Line 61: / Line 61: @@
 ===About Resistance===
-: The [[SI Unit|unit]] of '''resistance''' is the [[Ohm]] ([[Ω]]).
+: The [[SI Unit|unit]] of '''resistance''' is the [[Ohm]] (Ω).
 : '''Resistance''' cannot be directly [[measure]]d. '''Resistance''' must be calculated by dividing the [[Potential Difference]] by the [[Electrical Current|Current]].
 : [[Electrical Conductor|Conductors]] have a low '''resistance''' and [[Electrical Insulator|insulator]]s have a high '''resistance'''.
 ===Equation===

← Older revision		Revision as of 19:01, 25 February 2019
Line 154:		Line 154:

	<math>I\approx8.5A</math>		<math>I\approx8.5A</math>
		+	\|}
		+
		+	====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>
	\|}		\|}