If fuses of 250mA, 500mA, 1A, 5A, and 10A were available, which one would be the most suitable for protecting an amplifier rated at 240V, 180W?

Solution:

Given,

P = 180W

V = 240V

As we know that,

P = VI

Thus, evaluating the value of I

I = P/V = 180/240 = 0.75 A

Because of this, the fuse wire should be capable of withstanding currents up to 0.75A. As a result, a 1A fuse is more appropriate.