A circuit protected by a 10-amp fuse keeps blowing the fuse when operated. After replacing several fuses, what should be measured FIRST to diagnose the problem?

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Multiple choice — select the best answer

ASupply voltage with a voltmeter
BGround voltage with a voltmeter
CCircuit current draw with an ammeter
DCircuit resistance with an ohmmeter

✓ Correct answer: C. Circuit current draw with an ammeter The first measurement should be circuit current draw with an ammeter. This will show if the circuit is drawing excessive current (above 10 amps) which would explain why the fuse keeps blowing, and help determine if there's a short or overload condition.

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A circuit protected by a 10-amp fuse keeps blowing the fuse when operated. After replacing several fuses, what should be measured FIRST to diagnose the problem?

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