Long answer·Standard multi-step (3/5)·Calculator allowed
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Four identical cells, each of emf and internal resistance , are connected in series with an external resistor .
Total: 5 marks
(a) Find the equivalent emf and equivalent internal resistance. (2 marks)
(b) Find the current in the circuit. (2 marks)
(c) Find the terminal voltage of the battery of cells. (1 mark)
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