The work done by the motor is the increase in potential energy of the load of a known mass being lifted a given distance. The energy supplied to the motor is determined by measuring the voltage and current the motor needs to operate under a given load. Thus the efficiency of the motor can be calculated. Results of several data runs can be graphed to obtain plots of speed vs. current, efficiency vs. speed and efficiency vs. mass. The assembled apparatus, which is part of the P.S.S.C. Curriculum, consists of the small electric motor, the winch, a length of nylon thread and hook-up wires. An extra length of wire with an alligator clip, steel washers, a length of nichrome wire and instructions are also furnished. Requires additional items, which are part of the P.S.S.C collections, not included.
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