Kilowatt-hour - Revision history

Ellen References at 16:24, 13 December 2019

2019-12-13T16:24:16Z

Ellen References at 16:23, 13 December 2019

2019-12-13T16:23:57Z

NRJC: /* Example Calculations */

2019-06-11T07:52:41Z

‎Example Calculations

NRJC: /* About kilowatt-hours */

2019-06-11T07:52:06Z

‎About kilowatt-hours

NRJC: /* Key Stage 3 */

2019-06-11T07:50:29Z

‎Key Stage 3

NRJC at 18:40, 7 October 2018

2018-10-07T18:40:03Z

NRJC at 18:37, 7 October 2018

2018-10-07T18:37:06Z

NRJC at 18:25, 7 October 2018

2018-10-07T18:25:14Z

NRJC: Created page with "==Key Stage 3== ===Meaning=== A '''kilowatt-hour''' is a unit of energy used for electrical appliances and in Electrical Bills."

2018-10-07T18:24:46Z

Created page with "==Key Stage 3== ===Meaning=== A '''kilowatt-hour''' is a unit of energy used for electrical appliances and in Electrical Bills."

New page

==Key Stage 3==
===Meaning===
A '''kilowatt-hour''' is a [[unit]] of [[energy]] used for [[Electrical Appliance|electrical appliances]] and in [[Electrical Bill]]s.

← Older revision		Revision as of 16:24, 13 December 2019
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	:[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 ''Kilowatt-hour (kWh), pages 202, Gateway GCSE Physics, Oxford, 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 ''Kilowatt-hour (kWh), pages 202, Gateway GCSE Physics, Oxford, 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 ''Kilowatts (kW), pages 114, Gateway GCSE Physics, Oxford, OCR '']

← Older revision		Revision as of 16:23, 13 December 2019
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	: Energy = 1.875kilowatt-hours		: Energy = 1.875kilowatt-hours
	\|}		\|}
		+
		+	===References===
		+	====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 ''Kilowatt-hour (kWh), pages 202, Gateway GCSE Physics, Oxford, 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 ''Kilowatts (kW), pages 114, Gateway GCSE Physics, Oxford, OCR '']

@@ Line 11: / Line 11: @@
 : [[Energy]] ([[kilowatt-hour]]s) = [[Power]] ([[kilowatt]]s) x [[time]] ([[hour]]s)
-===Energy Usage of Appliances===
+===Example Calculations===
 : The amount of [[energy]] an '''appliance''' uses depends on the power rating and how long the '''appliance''' is used for.
 : [[Energy]] usage for '''appliances''' is measured in [[kilowatt-hour]]s. This means all [[power]] ratings need to be in [[kilowatt]]s and time should be in [[hour]]s.

@@ Line 6: / Line 6: @@
 : The '''kilowatt-hour''' is used by electricity suppliers instead of [[Joule]]s.
 : A '''kilowatt-hour''' is calculated by multiplying the power rating of an appliance in [[kilowatt]]s by the time the appliance is used for in [[hour]]s.
 : [[Energy]] ([[kilowatt-hour]]s) = [[Power]] ([[kilowatt]]s) x [[time]] ([[hour]]s)
 ===Energy Usage of Appliances===

← Older revision		Revision as of 07:50, 11 June 2019
Line 8:		Line 8:
	: [[Energy]] ([[kilowatt-hour]]s) = [[Power]] ([[kilowatt]]s) x [[time]] ([[hour]]s)		: [[Energy]] ([[kilowatt-hour]]s) = [[Power]] ([[kilowatt]]s) x [[time]] ([[hour]]s)
	: A '''kilowatt-hour''' is 3,600,000 [[Joule]]s.		: A '''kilowatt-hour''' is 3,600,000 [[Joule]]s.
		+
		+	===Energy Usage of Appliances===
		+	: The amount of [[energy]] an '''appliance''' uses depends on the power rating and how long the '''appliance''' is used for.
		+	: [[Energy]] usage for '''appliances''' is measured in [[kilowatt-hour]]s. This means all [[power]] ratings need to be in [[kilowatt]]s and time should be in [[hour]]s.
		+	: [[Energy]] can be calculated with the equation: [[Energy]] = [[Power]] x [[time]]
		+
		+	{\| class="wikitable"
		+	\|+ The Power ratings of some electrical appliances.
		+	\|-
		+	\| style="height:20px; width:250px; text-align:center;" \|'''Filament Bulb'''
		+	A 60[[Watt]] filament bulb may be used for 8 hours a day. Calculate the [[energy]] in kilowatt-hours.
		+	\| style="height:20px; width:250px; text-align:center;" \|'''Energy Saving Bulb'''
		+	A 25[[Watt]] energy saving bulb may be used for 8 hours a day. Calculate the [[energy]] in kilowatt-hours.
		+	\| style="height:20px; width:250px; text-align:center;" \|'''Kettle'''
		+	A 2000[[Watt]] kettle may be used for 30 minutes a day. Calculate the [[energy]] in kilowatt-hours.
		+	\|-
		+	\| style="height:20px; width:250px; text-align:left;" \|
		+	: Power = 60W = 0.060kW
		+	: Time = 8 hours
		+	: Energy = Power x time
		+	: Energy = 0.060 x 8
		+	: Energy = 0.48kilowatt-hours
		+
		+	\| style="height:20px; width:250px; text-align:left;" \|
		+	: Power = 25W = 0.025kW
		+	: Time = 8 hours
		+	: Energy = Power x time
		+	: Energy = 0.025 x 8
		+	: Energy = 0.20kilowatt-hours
		+
		+	\| style="height:20px; width:250px; text-align:left;" \|
		+	: Power = 2000W = 2.0kW
		+	: Time = 30 minutes = 0.5hours
		+	: Energy = Power x time
		+	: Energy = 2.0 x 0.5
		+	: Energy = 1.0kilowatt-hours
		+	\|-
		+	\| style="height:20px; width:250px; text-align:center;" \|'''Television'''
		+	A 250[[Watt]] television is left on for 3 hours each day. Calculate the [[energy]] in kilowatt-hours.
		+	\| style="height:20px; width:250px; text-align:center;" \|'''Refrigerator'''
		+	A 200[[Watt]] refrigerator is on for 24 hours each day. Calculate the [[energy]] in kilowatt-hours.
		+	\| style="height:20px; width:250px; text-align:center;" \|'''Oven'''
		+	A 2500[[Watt]] oven is used for 45 minutes each day. Calculate the [[energy]] in kilowatt-hours.
		+	\|-
		+	\| style="height:20px; width:250px; text-align:left;" \|
		+	: Power = 250W = 0.25kW
		+	: Time = 3 hours
		+	: Energy = Power x time
		+	: Energy = 0.25 x 3
		+	: Energy = 0.75kilowatt-hours
		+
		+	\| style="height:20px; width:250px; text-align:left;" \|
		+	: Power = 200W = 0.20kW
		+	: Time = 24 hours
		+	: Energy = Power x time
		+	: Energy = 0.20 x 24
		+	: Energy = 4.8kilowatt-hours
		+
		+	\| style="height:20px; width:250px; text-align:left;" \|
		+	: Power = 2500W = 2.5kW
		+	: Time = 45 minutes = 0.75 hours
		+	: Energy = Power x time
		+	: Energy = 2.5 x 0.75
		+	: Energy = 1.875kilowatt-hours
		+	\|}

@@ Line 5: / Line 5: @@
 ===About kilowatt-hours===
 : The '''kilowatt-hour''' is used by electricity suppliers instead of [[Joule]]s.
 : A '''kilowatt-hour''' is 3,600,000 [[Joule]]s.

← Older revision		Revision as of 18:37, 7 October 2018
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	===Meaning===		===Meaning===
	A '''kilowatt-hour''' is a [[unit]] of [[energy]] used for [[Electrical Appliance\|electrical appliances]] and in [[Electrical Bill\|electrical bills]].		A '''kilowatt-hour''' is a [[unit]] of [[energy]] used for [[Electrical Appliance\|electrical appliances]] and in [[Electrical Bill\|electrical bills]].
		+
		+	===About kilowatt-hours===
		+	: The '''kilowatt-hour''' is used by electricity suppliers instead of [[Joule]]s.
		+	: A '''kilowatt-hour''' is 3,600,000 [[Joule]]s.

@@ Line 1: / Line 1: @@
 ==Key Stage 3==
 ===Meaning===
-A '''kilowatt-hour''' is a [[unit]] of [[energy]] used for [[Electrical Appliance|electrical appliances]] and in [[Electrical Bill]]s.
+A '''kilowatt-hour''' is a [[unit]] of [[energy]] used for [[Electrical Appliance|electrical appliances]] and in [[Electrical Bill|electrical bills]].