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Work, energy and power(Ian) (P2.1 Work and power (Work done = energy…
Work, energy and power(Ian)
P2.1 Work and power
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KE=2/1mv^2, m=mass in kg; v=velocity in m/s
W=ΔE, ΔE=change in energy, power(W)=energy(J)/time(s)
Efficiency=useful energy output/energy input X 100% Efficiency=useful power output/power input X 100%
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P2.4 Energy resources
Non-renewable energy
Coal, oil, gas fired power stations and Nuclear power
renewable energy
Wind energy, Geothermal power stations, Wave power, Solar cells ,Solar power station and Tidal power
P2.2 Energy
Types of energy
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Chemical energy
Stored energy that can be released in a chemical reaction
e.g. a battery, fuel such as coal
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Light energy
Energy given off, for example, by very hot objects
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