Comprehension Questions: Power and Energy

Description

This is a short lesson about power and energy of electricity
Nursultan Zhakupov
Quiz by Nursultan Zhakupov, updated more than 1 year ago
Nursultan Zhakupov
Created by Nursultan Zhakupov over 7 years ago
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Resource summary

Question 1

Question
An electric heater uses 60 kJ of electrical energy in five minutes. What is the power rating of the heater?
Answer
  • 720 kW
  • 12 kW
  • 1.2 kW
  • 200 W

Question 2

Question
A small heater has a rating of 15V, 4A. How much energy does it consume if it is turned on for two minutes?
Answer
  • 7.5 J
  • 120 J
  • 450 J
  • 7200 J

Question 3

Question
Figure shows the electrical information of an electrical appliance. (a) What is the current generated if the casserole is turned on at normal operating voltage of 230V and a power of 1400 W?
Answer
  • 0.16 A
  • 6.1 A
  • 28 A
  • 322 A

Question 4

Question
(b) How much electrical energy is consumed for one month (30 days), if the casserole is turned on for 2 hours everyday?
Answer
  • 2.8 kJ
  • 42 kJ
  • 84 kJ
  • 302 MJ
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