Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 91 · 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 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
3. 3.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
7. 7.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
8. 8.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
14. 14.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
17. 17.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
18. 18.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
19. 19.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
21. 21.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
26. 26.True or false: to use LED lamps saves electricity. (a) True (b) False
27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
31. 31.True or false: to use daylight to read wastes electricity. (a) False (b) True
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to use daylight to read saves electricity. (a) False (b) True
35. 35.True or false: to use LED lamps wastes electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.True or false: to iron one shirt at a time saves electricity. (a) False (b) True

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