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physics > electrical appliances > Flashcards

electrical appliances Flashcards

1
Q

useful and wasted energy from electric heater

A

useful- heat

wasted- light

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2
Q

useful and wasted energy from toaster

A

useful- heating bread

waste- energy heating the toaster

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3
Q

useful and wasted energy from hairdryer

A

useful- kinetic and hear

waste- sound, heating hairdryer

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4
Q

what affects the rate of how fast an appliance transfers energy

A

the more powerful an appliance the faster it transfers energy

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5
Q

how to calculate power

A

power= energy/ time

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6
Q

what is 1 Watt equal to in Joules

A

1J/s (one joule per second)

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7
Q

how to work out power effientcy

A

same as energy

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8
Q

what does the energy supplies to an appliance depend on

A
  1. how long it is used for

2. the power supplies to it

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9
Q

equation for how much energy is supplied to something

A

energy= power X time

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10
Q

what does the electricity meter in your home measure

A

how much electrical energy your family uses (kWh)

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11
Q

equation to work out total cost

A

total cost= number of kWh used X cost per kWh

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12
Q

what does cost effective mean

A

how much something gives value for money

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13
Q

what to consider when considering cost effectiveness

A
  1. capital costs- buying/ installing
  2. running costs- fuel/ maintenance
  3. environmental costs- tax/ disposal
  4. other- interest on loans
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14
Q

useful and wasted energy from lightbulb

A

useful- light

wasted- heat

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15
Q

how easily can electrical appliances transfer electrical energy into useful energy

A

electrical appliances can transfer electrical energy into useful energy at the flick of a switch

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16
Q

what do we use everyday appliances for

A 
heating 
lighting
creating doubt
creating visual images
making objects move
17
Q

how much energy should an electrical appliance waste

A

an electrical appliance is designed for a particular purpose

and should Waste as little energy as possible

18
Q

what is power

A

the rate of transfer of energy

19
Q

what is kWh a unit of

A

a unit of energy

physics (10 decks)

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