A renewable energy source - solar, wind, waves, tides, Advantages of renewable energy - no greenhouse gases produced, Disadvantages of renewable energy - expensive to set up, can damage habitats when built, The definition of power - The rate of change of energy, An advantage of electromagnets - They can be turned on/off, Ammeters go in - series, Voltmeters go in - parallel, A digital input device - switch, An analogue output device - loudspeaker, As the temperature of a gas increases, the volume - increases,

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