A fuse in a motor vehicle electrical system has a resistance of 0.05 Ω. It is designed to blow when the power dissipation exceeds 50 W. What is the current rating of the fuse?

Question

Ivy Rodriguez

Physics

26 January, 12:54

A fuse in a motor vehicle electrical system has a resistance of 0.05 Ω. It is designed to blow when the power dissipation exceeds 50 W. What is the current rating of the fuse?

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Answers (1)

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Sonny Potts · Answer 1

Answer: 31,6 A

Explanation: In order to answer this question we have to use the exptression for the power for any electric sysyem which is given by:

P=I*V where I and V are the current and voltage.

This system can operate as maximum at 50 W so by using Ohm law

P = I^2*R in this case R=0.05Ω

The I = (50 / 0.05) ^1/2 = 31.6 A