Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 579 · 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 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
5. 5.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
11. 11.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
12. 12.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to use LED lamps wastes electricity. (a) True (b) False
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) close the fridge quickly
16. 16.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave the TV on standby
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
27. 27.True or false: to use daylight to read wastes electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
30. 30.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
33. 33.True or false: to close the fridge quickly saves electricity. (a) True (b) False
34. 34.True or false: to leave fridge door open saves electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
37. 37.🧾 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?
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 4 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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