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Practical Electricity_4NA_Part Ia

Quiz by Jessica Lew

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10 questions
Show answers
  • Q1

    A torchlight consists of a light bulb and a 5.00 V battery. A current of 0.5 A passes through the bulb. Calculate the the power of the bulb

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    Type an Answer
    60s
  • Q2

    Calculate the electrical energy(J) supplied to the bulb in three minutes.

    Given: V= 4.5 V, I= 0.2 A, time = 180 s

    Question Image

    162

    36

    0.9

    60s
  • Q3

    An air conditioner rated 2 kW, 240 V is switched on for 20 minutes.

    Power: 2000 W 

    Voltage: 240 V

    time: 20 minutes= 1/3 hour

    Convert the power to kW

    0.2 kW

    200 kW

    2 kW

    2000 kW

    60s
  • Q4

    An air conditioner rated 2 kW, 240 V is switched on for 10 minutes.

    Power: 2000 W 

    Voltage: 480 V

    time: 10 minutes= 1/6 hour

    Calculate the current required by the air conditioner 

    8.33 A

    0.12A

    4.17A

    60s
  • Q5

    An air conditioner rated 2 kW, 240 V is switched on for 10 minutes.

    Power: 2000 W 

    Voltage: 480 V

    Time: 10 minutes=10 x 60 = 600 s

    How much electrical energy is used by the air conditioner? 

    2.4× 10 6J

    1.2 × 10 6J

    40000 J

    60s
  • Q6

    The resistance of the heating element in a heater is 30 Ω. The heater is connected to a 480 V mains supply.

    Given:

    R = 30Ω

    V= 480V

    Find the current passing through the heating element

    0.125 A

    16A

    8 A

    60s
  • Q7

    The resistance of the heating element in a heater is 30 Ω. The heater is connected to a 480 V mains supply.

    Given:

    R = 30Ω

    V= 480 V

    Find the power of the heater

    (Clue: use V=IR first to calculate I then use P=VI to calculate power)

    8 W

    1920 W

    7680W

    60s
  • Q8

    The resistance of the heating element in a heater is 30 Ω. The heater is connected to a 240 V mains supply.

    Given:

    R = 30Ω

    V= 240 V

    P=1920 W

    Calculate the amount of heat produced by the heater in one minute

    115200 J

    1920 J

    60s
  • Q9

    What is the SI unit for power?

    Joules

    Ampere

    Watt

    30s
  • Q10

    What is the SI unit for Energy?

    Watt

    Ampere

    Joules

    30s

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