independent - variable that is deliberately changed, dependent - variable that is the result, control - variables that must stay the same to keep the experiment fair, density - mass/volume, digital balance - measures mass, Eureka can - displaces water of same volume as object, alpha - a helium nucleus, beta - a high energy electron, gamma - a high frequency electromagnetic wave, half-life - time taken for radioactive atoms to decay to half their number or count rate, ionising power - how much the radiation will damage DNA, penetrating power - how well the radiation will get through materials, step up - transformer that increases voltage to reduce energy loss through heat, step down - transformer that reduced voltage to make it safe for consumers in houses, ammeter - measures current, has to go in series, voltmeter - measures potential difference, has to go in parallel, geothermal - power station that uses energy stored under the Earth's crust, hydroelectric - power station that uses the GPE stored in reservoirs high up, wind turbine - transfers the wind's kinetic energy into electrical energy, resistance - measured in ohms, increases as the length of wire increases,

Physics Paper 1 revision

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