P1.3 Flashcards

1
Q

How can the cost of using electrical appliances be worked out?

A

Only if we know the amount of energy transferred in a given time.

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2
Q

What is the equation used to find the energy transferred from an appliance?

A

Energy transferred in joules (E) =power in watts (P) x time in seconds (t)

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3
Q

What is the cost of electricity supplied by the mains measured in?

A

pence per kilowatt-hours

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4
Q

What is the difference between watts and kilowatt-hours?

A

Watts are a unit of power, but kilowatt-hours are a unit of energy

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5
Q

How can kilowatt-hours be calculated?

A

energy transferred in kilowatt-hours = power in kilowatts x time in hours

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6
Q

Name some different examples of energy transfers.

A

Light bulbs, display screens: electricity-light
kettles, heaters:electricity-energy transfer by heating
motors:electricity-kinetic energy
radios:electricity-sound energy

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7
Q

how can kettles be used more efficiently?

A

by only heating the amount of water needed

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