Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 115 · 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 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
4. 4.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
8. 8.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
10. 10.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
15. 15.🧾 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?
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use daylight to read
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
18. 18.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🧾 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?
22. 22.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
27. 27.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.True or false: to use LED lamps wastes electricity. (a) True (b) False
30. 30.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
31. 31.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
40. 40.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs

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