Resistance and Ohm's law Quiz
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5 questions, one answer each
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1. A resistor has 6.0 V across it and carries 2.0 A. What is its resistance?
- A. 12 Ω
- B. 0.33 Ω
- C. 3.0 Ω
- D. 8.0 Ω
2. A wire has a length of 1.0 m and a resistance of 5.0 Ω. What is the resistance of 2.0 m of the same wire?
- A. 5.0 Ω
- B. 10 Ω
- C. 2.5 Ω
- D. 20 Ω
3. What happens to the resistance of an LDR when light gets brighter?
- A. It decreases
- B. It increases
- C. It stays the same
- D. It becomes zero
4. Which component has an I-V graph showing almost no current when the p.d. is reversed?
- A. Fixed resistor
- B. Filament lamp
- C. LDR
- D. Diode
5. Which change would give a wire a lower resistance?
- A. A longer wire
- B. A thinner wire
- C. A thicker wire of the same length
- D. A hotter wire