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Cells, emf, Internal Resistance

A cell has an emf 1.5V. When connected across an external resi

Question

Medium

Solving time: 3 mins

A cell has an emf 1.5V. When connected across an external resistance of $2 Ω$ , the terminal potential difference falls to 1.0V. The internal resistance of the cell is:

2 Ω

1.5 Ω

1.0 Ω

0.5 Ω

Views: 6,361 students

Updated on: Feb 15, 2023

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Asher Discussed

A cell has an emf 1.5V. When connected across an external resistance of

2 Ω

, the terminal potential difference falls to 1.0V. The internal resistance of the cell is:

8 mins ago

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Text solutionVerified

Internal resistance of the cell is given by

r = (\frac{E - V}{V}) R

Given

E = 1.5 V, V = 1.0 V, R = 2Ω

∴ r = (\frac{1.5 - 1.0}{1.0}) \times 2 = \frac{0.5}{1.0} x = 1.0Ω

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Question Text	A cell has an emf 1.5V. When connected across an external resistance of $2 Ω$ , the terminal potential difference falls to 1.0V. The internal resistance of the cell is:
Updated On	Feb 15, 2023
Topic	Current Electricity
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 7
Upvotes	763
Avg. Video Duration	3 min

A cell has an emf 1.5V. When connected across an external resistance of $2 Ω$ , the terminal potential difference falls to 1.0V. The internal resistance of the cell is:

Text solutionVerified

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A cell has an emf 1.5V. When connected across an external resistance of $2 Ω$ , the terminal potential difference falls to 1.0V. The internal resistance of the cell is: