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Two identical fuses, each rated at 10 A, are connected together. Which of the following statements is correct?

1. in parallel, the combination acts as a fuse of rating 20 A
2. in parallel, the combination acts as a fuse of rating 5 A
3. in series, the combination acts as a fuse of rating 10 A
4. in series, the combination acts as a fuse of rating 20 A

Correct answer: in parallel, the combination acts as a fuse of rating 20 A

Solution

In parallel, the total current splits equally so each fuse carries half; the combination can carry 20 A before each individual fuse reaches its 10 A limit.

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