Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 194 · 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.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
3. 3.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
4. 4.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
6. 6.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
8. 8.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
11. 11.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
16. 16.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
20. 20.True or false: to switch off empty rooms saves electricity. (a) False (b) True
21. 21.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
28. 28.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.True or false: to use LED lamps saves electricity. (a) True (b) False
36. 36.True or false: to use old filament bulbs saves electricity. (a) False (b) True
37. 37.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.True or false: to leave the TV on standby wastes electricity. (a) False (b) True

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