Electromotive Force and Potential Difference Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. What is electromotive force (e.m.f.)?
- A. The resistance of a source
- B. The electrical work done by a source in moving a unit charge around a complete circuit
- C. The current supplied by a source
- D. The heat lost in a source
2. How is a voltmeter connected in a circuit?
- A. In series with the component
- B. In parallel across the component
- C. Directly across the cell only
- D. It is not connected to the circuit
3. Which equation correctly defines potential difference?
- A. V = I x R
- B. V = Q x t
- C. V = W / Q
- D. V = P / I
4. A source does 20 J of work moving 4 C of charge around a complete circuit. What is its e.m.f.?
- A. 80 V
- B. 5 V
- C. 0.2 V
- D. 24 V
5. Which statement best distinguishes e.m.f. from p.d.?
- A. E.m.f. is measured in amps, p.d. in volts
- B. E.m.f. relates to the whole circuit and the source; p.d. relates to a single component
- C. E.m.f. and p.d. are the same quantity with different names
- D. P.d. only applies to cells, e.m.f. only applies to resistors