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A 240-volt d.c. motor on brake test took 52 Amp when running at 1500 rpm. The spring balance at the end of the 76 cm
A 240-volt d.c. motor on brake test took 52 Amp when running at 1500 rpm. The spring balance at the end of the 76 cm brake arm reads 93.5 N. What is the efficiency of the motor at this load?
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solution 2 x x N 60 2x x1500 60 157 rads Force on drum ...
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Conceptual Physics
Authors: Paul G. Hewitt
11th edition
321568095, 9780-032166256, 321662563, 978-0321568090
