Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 301 · 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 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
10. 10.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to switch off empty rooms saves electricity. (a) False (b) True
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
13. 13.🧾 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
14. 14.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
20. 20.True or false: to use LED lamps saves electricity. (a) True (b) False
21. 21.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.🧾 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?
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
31. 31.True or false: to use old filament bulbs saves electricity. (a) True (b) False
32. 32.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
33. 33.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
36. 36.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 7 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
39. 39.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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