Electric Current Quiz
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5 questions, one answer each
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1. Which instrument is used to measure electric current, and how must it be connected?
- A. A voltmeter, in parallel
- B. An ammeter, in series
- C. An ammeter, in parallel
- D. A voltmeter, in series
2. What carries electric current through a metal wire?
- A. Protons
- B. Neutrons
- C. Free electrons
- D. Positive ions
3. Which statement correctly distinguishes d.c. from a.c.?
- A. D.c. reverses direction repeatedly; a.c. flows one way
- B. D.c. flows in one direction only; a.c. repeatedly reverses direction
- C. Both flow in one direction only
- D. Both repeatedly reverse direction
4. A charge of 20 C passes a point in a wire in 5 s. What is the current?
- A. 100 A
- B. 25 A
- C. 4 A
- D. 0.25 A
5. In a circuit, conventional current flows from the positive terminal to the negative terminal. In which direction do the free electrons actually move?
- A. From positive to negative, same as conventional current
- B. From negative to positive, opposite to conventional current
- C. Electrons do not move in a circuit
- D. Electrons move randomly with no net direction