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Physics > Work Power Wnd Effiency > Flashcards

Work Power Wnd Effiency Flashcards

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1
Q

What is energy transferred the same as?

A

Work done

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2
Q

What is the equation for work done involving force and distance?

A

Force times distance,W=Fxd

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3
Q

What is work done measured in?

A

Joules,J

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4
Q

What is force measured in?

A

Newtons,N

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5
Q

What is the distance measured in?

A

Metres,m

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6
Q

What is the equation for power involving work done and time?

A

Work done divided by time, power=w/t

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7
Q

What is power measured in?

A

Watts,w

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8
Q

What is time measured in?

A

Seconds,s

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9
Q

Define power

A

The amount of energy transferred per second

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10
Q

Define efficiency

A

How good the devices at transferring energy input to useful energy output

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11
Q

What is the calculation for efficiency?

A

Used for energy divided by total energy supplied

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12
Q

How do you calculate percentage efficiency?

A

Efficiency times 100

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13
Q

What is useful energy transferred in total energy supplied measured in?

A

Joules

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14
Q

What is the useful energy and wasted energy in an electric kettle?

A

The useful energy is the energy that heats the water and the wasted energy is the eternal energy heating. The kettle and infrared radiation lost the surroundings.

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15
Q

What is the useful energy for a hairdryer and the wasted energy for a hairdryer?

A

Useful is the internal energy heating and the kinetic energy of the fan. The wasted energy is the sound radiation and internal energy heating. The hair dryer

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16
Q

Useful and wasted energy for a lightbulb

A

Useful energy is the light radiation by hot filament and the wasted energy is the infrared radiation

17
Q

What is the useful and wasted energy for a TV?

A

The useful energy is the light radiation that allows the image to be seen and the sound radiation and the wasted energy is the internal energy and infrared radiation

Physics (10 decks)

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