Variable Resistor - Revision history

Ellen References at 10:41, 25 December 2019

2019-12-25T10:41:32Z

Ellen References at 17:10, 14 November 2019

2019-11-14T17:10:51Z

NRJC at 15:41, 28 February 2019

2019-02-28T15:41:04Z

NRJC at 15:51, 27 February 2019

2019-02-27T15:51:06Z

NRJC at 15:44, 27 February 2019

2019-02-27T15:44:53Z

NRJC: Created page with "==Key Stage 4== ===Meaning=== The symbol for a '''variable resistor'''."

2019-02-27T15:23:38Z

Created page with "==Key Stage 4== ===Meaning=== right|300px|thumb|The symbol for a '''variable resistor'''."

New page

==Key Stage 4==
===Meaning===
[[File:VariableResistorSymbol.png|right|300px|thumb|The symbol for a '''variable resistor'''.]]

← Older revision		Revision as of 10:41, 25 December 2019
Line 66:		Line 66:
	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Variable resistors, pages 293, 296, GCSE Combined Science Trilogy 1, Hodder, AQA '']		:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Variable resistors, pages 293, 296, GCSE Combined Science Trilogy 1, Hodder, AQA '']
	:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Variable resistors, pages 52-53, GCSE Physics; Third Edition, Oxford University Press, AQA '']		:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Variable resistors, pages 52-53, GCSE Physics; Third Edition, Oxford University Press, AQA '']
		+
		+	====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 ''Variable resistors, page 105, 113, Gateway GCSE Physics, Oxford, OCR '']

← Older revision		Revision as of 17:10, 14 November 2019
Line 58:		Line 58:
	\| style="height:20px; width:300px; text-align:center;" \|This '''variable resistor''' is known as a [[Rheostat]]. The slider can be moved to change [[Electrical Resistance\|resistance]].		\| style="height:20px; width:300px; text-align:center;" \|This '''variable resistor''' is known as a [[Rheostat]]. The slider can be moved to change [[Electrical Resistance\|resistance]].
	\|}		\|}
		+
		+	===References===
		+	====AQA====
		+
		+	:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Variable resistor, page 52, GCSE Physics; Student Book, Collins, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Variable resistors, circuit symbol, page 38, GCSE Physics, Hodder, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Variable resistors, pages 293, 296, GCSE Combined Science Trilogy 1, Hodder, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Variable resistors, pages 52-53, GCSE Physics; Third Edition, Oxford University Press, AQA '']

← Older revision		Revision as of 15:41, 28 February 2019
Line 47:		Line 47:

	<math>I = 0.4A</math>		<math>I = 0.4A</math>
		+	\|}
		+
		+	===Examples===
		+	{\| class="wikitable"
		+	\|-
		+	\|[[File:VariableResistor.png\|center\|100px]]
		+	\|[[File:Rheostat.png\|center\|300px]]
		+	\|-
		+	\| style="height:20px; width:300px; text-align:center;" \|This '''variable resistor''' can be turned to change the [[Electrical Resistance\|resistance]].
		+	\| style="height:20px; width:300px; text-align:center;" \|This '''variable resistor''' is known as a [[Rheostat]]. The slider can be moved to change [[Electrical Resistance\|resistance]].
	\|}		\|}

← Older revision		Revision as of 15:51, 27 February 2019
Line 7:		Line 7:
	: A '''variable resistor''' can be used to control the [[Electrical Current\|current]] passing through a [[circuit]]. If the [[Potential Difference\|potential difference]] is constant then the [[Electrical Current\|current]] decreases as the [[Electrical Resistance\|resistance]] of the '''variable resistor''' increases.		: A '''variable resistor''' can be used to control the [[Electrical Current\|current]] passing through a [[circuit]]. If the [[Potential Difference\|potential difference]] is constant then the [[Electrical Current\|current]] decreases as the [[Electrical Resistance\|resistance]] of the '''variable resistor''' increases.
	: A '''variable resistor''' can be used to control the [[Potential Difference\|potential difference]] of another [[Electrical Component\|component]] in [[Series Circuit\|series]] with it. If the [[Electrical Resistance\|resistance]] of the '''variable resistor''' is increased the [[Potential Difference\|potential difference]] across other [[Electrical Component\|components]] will decrease.		: A '''variable resistor''' can be used to control the [[Potential Difference\|potential difference]] of another [[Electrical Component\|component]] in [[Series Circuit\|series]] with it. If the [[Electrical Resistance\|resistance]] of the '''variable resistor''' is increased the [[Potential Difference\|potential difference]] across other [[Electrical Component\|components]] will decrease.
		+
		+	{\| class="wikitable"
		+	\|-
		+	\|[[File:PotentialDivider1.png\|center\|200px]]
		+	\|[[File:PotentialDivider2.png\|center\|200px]]
		+	\|[[File:PotentialDivider3.png\|center\|200px]]
		+	\|-
		+	\| style="height:20px; width:200px; text-align:left;" \|In this [[circuit]] the '''variable resistor''' has a [[Electrical Resistance\|resistance]] of 0Ω.
		+
		+	The [[Potential Difference\|potential difference]] across the fixed [[resistor]] is 6V.
		+
		+	The [[Electrical Current\|current]] through this [[circuit]] is given by:
		+
		+	<math>I = \frac{V}{R}</math>
		+
		+	<math>I = \frac{6}{5}</math>
		+
		+	<math>I = 1.2A</math>
		+	\| style="height:20px; width:200px; text-align:left;" \|In this [[circuit]] the '''variable resistor''' has the same [[Electrical Resistance\|resistance]] as the fixed [[resistor]] (5Ω).
		+
		+	The [[Potential Difference\|potential difference]] across the fixed [[resistor]] is 3V.
		+
		+	The [[Electrical Current\|current]] through this [[circuit]] is given by:
		+
		+	<math>I = \frac{V}{R}</math>
		+
		+	<math>I = \frac{6}{10}</math>
		+
		+	<math>I = 0.6A</math>
		+	\| style="height:20px; width:200px; text-align:left;" \|In this [[circuit]] the '''variable resistor''' has twice the [[Electrical Resistance\|resistance]] of the fixed [[resistor]] (10Ω).
		+
		+	The [[Potential Difference\|potential difference]] across the fixed [[resistor]] is 2V.
		+
		+	The [[Electrical Current\|current]] through this [[circuit]] is given by:
		+
		+	<math>I = \frac{V}{R}</math>
		+
		+	<math>I = \frac{6}{15}</math>
		+
		+	<math>I = 0.4A</math>
		+	\|}

← Older revision		Revision as of 15:44, 27 February 2019
Line 2:		Line 2:
	===Meaning===		===Meaning===
	[[File:VariableResistorSymbol.png\|right\|300px\|thumb\|The symbol for a '''variable resistor'''.]]		[[File:VariableResistorSymbol.png\|right\|300px\|thumb\|The symbol for a '''variable resistor'''.]]
		+	A '''variable resistor''' is a [[resistor]] which can have its [[Electrical Resistance\|resistance]] changed.
		+
		+	===About Variable Resistors===
		+	: A '''variable resistor''' can be used to control the [[Electrical Current\|current]] passing through a [[circuit]]. If the [[Potential Difference\|potential difference]] is constant then the [[Electrical Current\|current]] decreases as the [[Electrical Resistance\|resistance]] of the '''variable resistor''' increases.
		+	: A '''variable resistor''' can be used to control the [[Potential Difference\|potential difference]] of another [[Electrical Component\|component]] in [[Series Circuit\|series]] with it. If the [[Electrical Resistance\|resistance]] of the '''variable resistor''' is increased the [[Potential Difference\|potential difference]] across other [[Electrical Component\|components]] will decrease.