A 120 V lamp-dimming circuit is controlled by a rheostat and protected from exce

Question

A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

Options:

A . 2

B . 20

C . 40

D . 4

Answer: Option B

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