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1912223
The usefulness of electrical appliances p1.3
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munira mansaray
, updated more than 1 year ago
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munira mansaray
over 9 years ago
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Resource summary
The usefulness of electrical appliances p1.3
energy and appliances
energy transfers from a power station to schools,homes and industry as an electrical current
power is how much electrical energy,in joules,is transformed per second,into another energy..
the higher the power the more current it needs .
power is measured in WATTS (W)
one watt is the same as 1 joule per second
example
220 jouels and 2 seconds = (p) power= energy divided by time (in seconds)=220 divided by 2 =110w
The cost of electricity
where 1kw=1000W.the power rating of an appliance is shown on a label
the unit of electrical cost is the Kilowatt hour (kwh)
E=P*T
ENERGY TRANSFERED=POWER*TIME
TOTAL COST O ELECTRICAL APPLIANCE =KWH*COST PER UNIT IN PENCE
TOTAL=NUMBER OF KILOWATT-HOURS *COST PER KILOWATT-HOUR
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