# The usefulness of electrical appliances p1.3

Mind Map by munira mansaray, updated more than 1 year ago
 Created by munira mansaray about 5 years ago
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gcse

## Resource summary

The usefulness of electrical appliances p1.3
1 energy and appliances
1.1 energy transfers from a power station to schools,homes and industry as an electrical current
1.1.1 power is how much electrical energy,in joules,is transformed per second,into another energy..
1.1.1.1 the higher the power the more current it needs .
1.1.1.1.1 power is measured in WATTS (W)
1.1.1.1.1.1 one watt is the same as 1 joule per second
1.1.1.1.1.1.1 example
1.1.1.1.1.1.1.1 220 jouels and 2 seconds = (p) power= energy divided by time (in seconds)=220 divided by 2 =110w
2 The cost of electricity
2.1 where 1kw=1000W.the power rating of an appliance is shown on a label
2.1.1 the unit of electrical cost is the Kilowatt hour (kwh)
2.1.2 E=P*T
2.1.2.1 ENERGY TRANSFERED=POWER*TIME
2.1.2.1.1 TOTAL COST O ELECTRICAL APPLIANCE =KWH*COST PER UNIT IN PENCE
2.1.2.1.1.1 TOTAL=NUMBER OF KILOWATT-HOURS *COST PER KILOWATT-HOUR

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