Question

emf of 10 V having internal resistance of 5 ohm and connected across 15 ohm resistor then the potential difference across 15 ohm resistor​

Answer 1

Explanation:

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Answer 2

Given: Emf of battery= 10V, Internal resistance= 5ohm, External resistance= 15 ohm

To find: the potential difference across a 15-ohm resistor

Solution: Internal resistance is the resistance of the power supply. And internal resistance of the power supply only cause a change in terminal voltage and create a voltage drop across the internal resistance.

Here we can imagine that the internal resistance and external resistance are connected in series. Therefore

The total resistance of the circuit= external resistance+ internal resistance

R= 20ohm

Current throughout the circuit will be

I= 1/2A

The potential difference across 15ohm resistor will be = E-Ir = 10-(1/2×5)= 15/2 V

Therefore, the potential difference across 15-ohm resistor is 15/2 V.