P1 3 Electrical Energy Flashcards

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0
Q

What should electrical appliances do?

A

Waste as little energy as possible

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1
Q

What are electric appliances designed for?

A

A particular purpose

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2
Q

What is power?

A

The rate of energy transfer

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3
Q

If an appliance is more powerful, what happens to the rate at which it transfers energy?

A

It becomes faster

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4
Q

What is electrical power measured in?

A

Watts / kilowatts

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5
Q

What is a watt?

A

The rate of energy transfer of 1J/s.

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6
Q

How many watts are in a kilowatt?

A

1000

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7
Q

What is power equal to?

A

Energy/time

Power is in watts, energy is in joules and time is in seconds

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8
Q

How is the efficiency of power calculated?

A

Useful power out/ total power in (x100%)

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9
Q

What does the energy supplied to a device depend on?

A

How long it is used for and the power supplied to it.

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10
Q

What is a KWh?

A

A unit of energy; energy supplied to an 1KW appliance in an hour.

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11
Q

What does the total cost equal to?

A

The number of KWh used x cost per KWh

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12
Q

What do electrical appliances do?

A

They transfer electrical energy into useful energy very quickly.

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13
Q

What does cost effectiveness mean?

A

Getting the best value for money.

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14
Q

In order to compare the cost effectiveness of different appliances, what do you need to consider?

A

Account of costs to buy it, running costs and other costs such as environmental costs.

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