Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 521 · 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.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
15. 15.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave the TV on standby
16. 16.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
17. 17.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
20. 20.True or false: to leave fridge door open wastes electricity. (a) False (b) True
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) unplug idle chargers (d) switch off empty rooms
23. 23.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
24. 24.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
25. 25.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.True or false: to use daylight to read saves electricity. (a) False (b) True
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) set the AC to 24 °C
28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
33. 33.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
37. 37.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
38. 38.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to leave the TV on standby wastes electricity. (a) True (b) False

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