Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 783 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
2. 2.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
3. 3.True or false: to switch off empty rooms saves electricity. (a) True (b) False
4. 4.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
7. 7.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
8. 8.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
11. 11.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
13. 13.True or false: to use daylight to read wastes electricity. (a) True (b) False
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) set the AC to 24 °C
17. 17.True or false: to leave fridge door open saves electricity. (a) False (b) True
18. 18.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to close the fridge quickly saves electricity. (a) True (b) False
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
33. 33.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
34. 34.True or false: to use LED lamps saves electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.True or false: to use LED lamps wastes electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
40. 40.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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