Resistance Quiz
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5 questions, one answer each
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1. Which equation is used to calculate resistance?
- A. R = I / V
- B. R = V / I
- C. R = V x I
- D. R = I x t
2. Which instrument is connected in parallel to measure p.d. when finding resistance experimentally?
- A. Ammeter
- B. Thermometer
- C. Voltmeter
- D. Ohmmeter dial
3. How does the resistance of a metallic wire change if its cross-sectional area is doubled (length unchanged)?
- A. It doubles
- B. It halves
- C. It stays the same
- D. It quadruples
4. A component has a p.d. of 10 V across it and a current of 2 A through it. What is its resistance?
- A. 20 Ω
- B. 5 Ω
- C. 0.2 Ω
- D. 12 Ω
5. Why does the I–V graph of a filament lamp curve rather than staying a straight line?
- A. The lamp's resistance decreases as current increases
- B. The lamp's resistance increases as it heats up with increasing current
- C. The lamp is a diode
- D. Filament lamps do not conduct current