Internal Resistance Cell
Mediumphysics
Terminal voltage V of cell with emf E and internal resistance r delivering current I?
Select the correct option:
Solution
Incorrect! Answer:
V = E - I r
- Concept: Every real cell has some resistance to the flow of current within it, known as internal resistance (r).
- Internal Voltage Drop: When a current I flows through the cell, some potential is lost overcoming internal resistance. This 'lost volt' is equal to Ir.
- Definition: The potential difference across the terminals (V) is the net voltage available after this internal loss.
- Formula: V=E−Ir (while discharging).
- Note: If the cell were being charged, the terminal voltage would be V=E+Ir.
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- internal resistance cell
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
V = E - I r
- Concept: Every real cell has some resistance to the flow of current within it, known as internal resistance (r).
- Internal Voltage Drop: When a current I flows through the cell, some potential is lost overcoming internal resistance. This 'lost volt' is equal to Ir.
- Definition: The potential difference across the terminals (V) is the net voltage available after this internal loss.
- Formula: V=E−Ir (while discharging).
- Note: If the cell were being charged, the terminal voltage would be V=E+Ir.
This medium difficulty physics question is from the chapter current electricity, covering the topic of internal resistance cell. It appeared in the 2025 exam.
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