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D) 7.2 W Answer: B

4) Four unequal resistors are connected in a parallel circuit. Which one of the following statements is correct about this circuit?

  • A)

    The total resistance is less than the smallest resistor.

  • B)

    The total resistance is equal to the average of the resistance of all the resistors.

  • C)

    The total resistance is more than the largest resistor.

  • D)

    None of the other answers is correct.

Answer: A

5) A 100 V DC signal is applied to four resistors as shown in Figure. The values of the resistors are 20 , 40 , 60 , and 80 . What is the voltage across the 40 resistor?

  • A)

    20 V

  • B)

    40 V

  • C)

    60 V

  • D)

    80 V

Answer: A

6) A light bulb operating at a voltage of 120 V has a resistance of 200 . What is the power? A) 100 W B) 72 W C) 14 × 10-3 D) 7.2 W Answer: B W

7) Which one of the following is a correct statement for a number of resistors connected in series or parallel?

  • A)

    The total resistance in a series circuit decreases as more resistors are added.

  • B)

    The flow of current is difficult through resistors connected in a series circuit.

  • C)

    The voltage is different across resistors connected in a parallel circuit.

  • D)

    The total resistance in a parallel circuit decreases as more resistors are added.

Answer: D

8) Three resistors of values 2 , 6 and 12 are connected across a DC voltage source as shown in Figure. If the total current through the circuit is 2.0 A, what is the applied voltage?

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