Question

An MCB which cuts off the electricity supply in case of short-circuiting or overloading works in the
(a) chemical effect of current
(b) heating effect of current
(c) magnetic effect of current
(d) electroplating effect of current

Answer 1

Answer:

B

Explanation:

Answer 2

Answer is Heating Effect of Current

Explanation:

It is based upon Joule’s heating effect.

Heated dissipated in a conductor = $I \times I \times R \times t$

• I-current flowing in that conductor.

• R- resistance of that conductor

• t- duration of current flow

thus the heat generated is directly proportional to

square of current flow $(I^2)$

the resistance of the wire (R)

duration of the current flow. (t)