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A relay of resistance 6 Ω operates with a minimum current of 0.030 A. It is...

A relay of resistance 6 Ω operates with a minimum current of 0.030 A. It is required that the relay operate when the current in the line attains 0.240 A. What resistance should be used to shunt the relay?

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Answer #1

Relay of resistance 6 ohm operates with a current of 0.03 A.

Hence, voltage across the relay is

Now to increase the current to 0.24 A let us add a shunt of resistance R in parallel to the relay.

As the shunt is connected in parallel equivalent resistance is

So, current in the circuit is,

This is the resistance that must be used.

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