# Energy

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what is work done measured in...
work done is measured in Joules (J)
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what is the equation for work done?
work done = force x distance moved in direction of force (W= Fs)
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what is work done?
work done is the energy transferred
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what is power?
power is the rate of transfer of energy
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what is the equation for power?
work done/ time taken or energy transferred/ time taken
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what is power measured in?
power is measured in Watts (W)
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what is the conservation of energy
energy is conserved and cannot be created or destroyed
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how do you measure efficiency
efficiency = useful energy output/ total energy input
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what happens to wasted energy?
wasted energy is usually in a form that is not useful and is eventually dissipated in the surroundings as heat
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how is gravitational gained
gravitational energy is gained by an object because of it height
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what is the equation for gravitational potential energy
gravitational potential energy = mass x gravitational field strength x height (Ep = mgh)
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what is the equation for weight
weight = mass x gravitational field strength (W=mg)
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how is kinetic energy stored
kinetic energy is stored by an object moving
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what is the equation for kinetic energy
kinetic energy = 1/2 mass x velocity2 (1/2 Ek = 1/2 mv2)
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what is a renewable energy source?
an renewable energy source is one that can be replenished as it is used
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what are the main energy sources
wind, water (hydroelectric), tides, waves, biofuel, geothermal resources, solar cells, fossil fuels (coal, oil and natural gas),nuclear power
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what are energy resources used for
they are used for transport, heating and electricity geneartion
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they cannot because of political, social, ethical and economic concerns.
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## Other cards in this set

### Card 2

#### Front

what is the equation for work done?

#### Back

work done = force x distance moved in direction of force (W= Fs)

### Card 3

#### Front

what is work done?

what is power?

### Card 5

#### Front

what is the equation for power?