A shunt DC generator has a termianl voltage duringopen-circuit of 127V. When the

Question

A shunt DC generator has a termianl voltage duringopen-circuit of 127V. When the machine is operating at rated load,the rated terminal voltage is 120V. Find the load current ifthe field resistance is 15 ohms and the armature resistance is 0.02ohms. The answer becomes 342A but please show the steps to get theanswer of 342A. To protect my respect score I always rate within aday receiving the answer. Have a great day. A shunt DC generator has a termianl voltage duringopen-circuit of 127V. When the machine is operating at rated load,the rated terminal voltage is 120V. Find the load current ifthe field resistance is 15 ohms and the armature resistance is 0.02ohms. The answer becomes 342A but please show the steps to get theanswer of 342A. To protect my respect score I always rate within aday receiving the answer. Have a great day.

Explanation / Answer

Given Terminal voltage (open) Vt = 127V When operated at rated voltage VtL = 120V The armeture voltage Ea = Vt - VtL Ea = 127 - 120 = 7V The armeture current Ia = Ea / Ra = 7 / 0.02 =350A The field current If = VtL / Rf = 120 /15 = 8A Load current IL = Ia - If IL = 350 - 8 IL = 342A IL = 350 - 8 IL = 342A

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