Resistance and Power problems
- 1. If resistance decreases, then current will:
Options- A. decrease
- B. increase
- C. remain the same
- D. double Discuss
Correct Answer: increase
- 2. Wirewound resistors are usually used in circuits that have:
Options- A. high current
- B. negative temperature coefficients
- C. low power
- D. high voltage Discuss
Correct Answer: high current
- 3. How many ohms of resistance allows a current of 720 µA to flow when 3.6 kV is applied?
Options- A. 200 nΩ
- B. 5 kΩ
- C. 200 kΩ
- D. 5 MΩ Discuss
Correct Answer: 5 MΩ
- 4. With Ohm's law, if voltage increases and resistance stays the same:
Options- A. current remains the same
- B. power decreases
- C. current increases
- D. resistance decreases Discuss
Correct Answer: current increases
- 5. The six basic forms of energy are:
Options- A. light, sun, magnetic, chemical, electrical, and mechanical
- B. electrical, mechanical, light, heat, magnetic, and chemical
- C. electrical, mechanical, sun, heat, chemical, and light
- D. potential, sun, light, chemical, electrical, and mechanical Discuss
Correct Answer: electrical, mechanical, light, heat, magnetic, and chemical
- 6. How many basic types of resistors exist?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
Correct Answer: 2
- 7. How many connections does a potentiometer have?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
Correct Answer: 3
Explanation:
A potentiometer uses three connections, as opposed to a rheostat, which only employs two. Having three connections allows the potentiometer to vary voltage. Both the potentiometer and the rheostat are classified as variable resistors.
- 8. Components designed to oppose the flow of current are called:
Options- A. insulators
- B. conductors
- C. resistors
- D. heat exchangers Discuss
Correct Answer: resistors
- 9. With 1 mA of current, what wattage rating should a 470 ohm resistor have?
Options- A. 1/4 watt
- B. 1/2 watt
- C. 1 watt
- D. 2 watts Discuss
Correct Answer: 1/4 watt
- 10. If a variable resistor's resistance varies in a nonuniform manner as the shaft is moved, it is considered to be:
Options- A. linear
- B. defective
- C. not wirewound
- D. tapered Discuss
Correct Answer: tapered
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