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Home Electronics Resistance and Power Comments

  • Question
  • How is power dissipated in a resistor?


  • Options
  • A. by resistance
  • B. by voltage
  • C. by current
  • D. by heat

  • Correct Answer
  • by heat 


  • Resistance and Power problems


    Search Results


    • 1. 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
    • 2. The resistivity of copper is:

    • Options
    • A. 9.9 Ω
    • B. 10.7 Ω
    • C. 16.7 Ω
    • D. 17.0 Ω
    • Discuss
    • 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
    • 4. 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
    • 5. The unit designator for resistance value is the:

    • Options
    • A. ampere
    • B. ohm
    • C. volt
    • D. watt
    • Discuss
    • 6. What is the most commonly used conductor in electronics?

    • Options
    • A. aluminum
    • B. copper
    • C. gold
    • D. silver
    • Discuss
    • 7. The load resistance increases. How will the load current change?

    • Options
    • A. vary
    • B. remain constant
    • C. increase
    • D. decrease
    • Discuss
    • 8. 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
    • 9. 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
    • 10. If resistance decreases, then current will:

    • Options
    • A. decrease
    • B. increase
    • C. remain the same
    • D. double
    • Discuss


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