CAIE A-Level Physics 10.1.4 E.M.F. and Potential Difference
Practise distinguishing e.m.f. from p.d. by analysing energy transfer per unit charge between a source and circuit components.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- AS
Exam points
- distinguish e.m.f. from p.d. by identifying the direction and form of energy transfer per unit charge
- explain or interpret circuit situations in which source energy, component energy and p.d. differ
10.1.4—E.m.f. and potential difference (p.d.) in terms of energy considerations question 1
A battery of electromotive force (e.m.f.) E and internal resistance r is connected to a variable resistor of resistance R, as shown in Fig. 6.1.
Fig. 6.1
The current in the circuit is I and the potential difference across the variable resistor is V.
Explain, in terms of energy, why V is less than E.
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