Nursultan Zhakupov
Quiz by , created more than 1 year ago

Quiz on Power and Energy, created by Nursultan Zhakupov on 19/03/2017.

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Nursultan Zhakupov
Created by Nursultan Zhakupov about 7 years ago
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Power and Energy

Question 1 of 8

1

An electric heater takes a current of 4A from a 250 V supply when operating normally. How long would it take the heater to convert 400 kJ of electrical energy?

Select one of the following:

  • 400 s

  • 1000 s

  • 1600 s

  • 100 000 s

Explanation

Question 2 of 8

1

How much energy is converted in a resistor of 5.0 Ω carrying a current of 2.0 A for 10 seconds?

Select one of the following:

  • 4.0 J

  • 25 J

  • 100 J

  • 200 J

Explanation

Question 3 of 8

1

A lamp rated 6V, 2A is switched on for 60 seconds.
How much energy is used?

Select one of the following:

  • 0.2 J

  • 20 J

  • 180 J

  • 720 J

Explanation

Question 4 of 8

1

The SI unit of power is Volts.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 8

1

For a given electrical appliance information of “2000 W, 240 V”, it means that when an operating voltage of 240 V is applied across the appliance, the appliance converts electrical energy into thermal energy at a rate of 2000 J per minute.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 8

1

1 watt is equal to 1 Joule per second

Select one of the following:

  • True
  • False

Explanation

Question 7 of 8

1

The electrical energy has a unit of joules.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 8

1

To calculate the power P of any electrical appliance with a current I flowing through it and a potential difference V applied across it, we simply divide V by I.

Select one of the following:

  • True
  • False

Explanation

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