Question

The terminal potential difference of a cell of emf 2 V and internal resistance 0.1 Ω when supplying a current of 5 A will be
1. 2.5 V
2. 1.5 V
3. 10 V
4. None of the above

Answer 1

Correct Answer - Option 2 : 1.5 V

Concept:

Kirchhoff’s Voltage Law (KVL):

It states that the sum of the voltages or electrical potential differences in a closed network is zero. 

Mathematically we can express this as:

\(\mathop \sum \limits_{n = 1}^M {V_n} = 0\)

Where Vn represents the nth Voltage

M is the total number of voltage element.

Note: KCL is based on the law of conservation of charge.

Calculation:

Given:

V_s = 2V, R_int = 0.1Ω, I = 5A

Diagram

Let, the terminal voltage is V_T.

Now, Apply KVL in the circuit;

2 - 5 x 0.1 - V_T = 0

V_T = 1.5V

Hence, Option 2 is correct