Multiple choice

An electric locomotive has a maximum mechanical output of 4.0 MW. Electrical power is delivered at 25 kV from overhead wires. The overall efficiency of the locomotive in converting electrical power to mechanical power is 80%. What is the current from overhead wires, when locomotive is operating at its maximum power?

  1. 200 A

  2. 5 mA

  3. 6.25 mA

  4. 160 A

  5. 0.16 A
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A Correct answer
Explanation

With 80percent efficiency the power supplied is 4.0/0.8 Megawatts = 5Megawatts Electrical power = volts*amps 5*(106) = 25*(103)amps amps = 5 x 106/25(103) = 200amps Current drawn from overhead wires is 200amps

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