Resistance and Power problems
- 1. The unit designator for resistance value is the:
Options- A. ampere
- B. ohm
- C. volt
- D. watt Discuss
Correct Answer: ohm
- 2. Which is the most important step utilized when measuring resistors?
Options- A. use the highest possible scale
- B. keep test leads short
- C. zero the meter before using
- D. remove power from the circuit Discuss
Correct Answer: remove power from the circuit
- 3. If a metallic conductor has a positive temperature coefficient of resistance, then:
Options- A. as temperature increases, resistance decreases
- B. as current increases, resistance decreases
- C. as voltage increases, current increases
- D. as temperature increases, resistance increases Discuss
Correct Answer: as temperature increases, resistance increases
- 4. The resistivity of copper is:
Options- A. 9.9 Ω
- B. 10.7 Ω
- C. 16.7 Ω
- D. 17.0 Ω Discuss
Correct Answer: 10.7 Ω
- 5. What is the ratio of 13 to 47 expressed in percent?
Options- A. 2.76%
- B. 27.7%
- C. 3.60%
- D. 36.1% Discuss
Correct Answer: 27.7%
- 6. How is power dissipated in a resistor?
Options- A. by resistance
- B. by voltage
- C. by current
- D. by heat Discuss
Correct Answer: by heat
- 7. What is the most commonly used conductor in electronics?
Options- A. aluminum
- B. copper
- C. gold
- D. silver Discuss
Correct Answer: copper
- 8. The load resistance increases. How will the load current change?
Options- A. vary
- B. remain constant
- C. increase
- D. decrease Discuss
Correct Answer: decrease
- 9. With Ohm's law:
Options- A. current is inversely proportional to resistance
- B. resistance is directly proportional to voltage
- C. voltage is indirectly proportional to power
- D. current is directly proportional to resistance Discuss
Correct Answer: current is inversely proportional to resistance
- 10. Electrical equipment is protected against excessive current by a(n):
Options- A. fusible wire link
- B. insulated glass container
- C. metal ended coil
- D. circuit opener Discuss
Correct Answer: fusible wire link
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