Efficiency of a Motor

... Jessica Roper 11H Efficiency of a Motor Aim: To investigate the relationship between the efficiency of a motor and the load it is lifting. Apparatus: * Motor * 50cm length of cotton * Blue tack * 0.01Kg plasticine * Clamp * Boss * Ammeter * Voltmeter * Low Voltage Unit * 0.01Kg masses * Sellotape * Wires * Mass hook * Stopwatch Safety You should not use an electrical source with wet hands. Sockets should have nothing inserted into them other than plugs. This is because the voltage of a mains supply is 240V and this is enough to kill a human being. Water should be kept away from sockets, as water is a good conductor of electricity and therefore could potentially be lethal. For the same reason all wires should be insulated. As a general safety rule there should be no running in the laboratory and all bags should be placed under desks to avoid tripping. Diagrams Preliminary Results From my preliminary experiments I discovered that the cotton would not

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