Question

AB is part of a circuit as shown, that absorbs energy at a rate of 50 W. E is an emf device that has no internal resistance.

(A) Potential difference across AB is 48 V.

(B) Emf of the device is 48 V

(C) Point B is connected to the positive terminal of E.

(D) Rate of conversion from electrical to chemical energy is 48 W in device E

Answer 1

Correct option (B,D)

Explanation:

Resistance absorbs energy at the rate of 2WPotential difference across AB⇒ VAB. = 50 W

VAB = 50 V

Drop across resistor is 2V, therefore EMF of E is 48 V.

As AB is absorbing energy at the rate of 50 W, 48 W is being absorbed by E. Thus E is on charging. i.e. current is entering from +ve terminal of E.