Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 676 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
2. 2.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.🧾 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?
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
10. 10.🧾 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?
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
15. 15.True or false: to leave fridge door open wastes electricity. (a) False (b) True
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
21. 21.True or false: to use LED lamps saves electricity. (a) False (b) True
22. 22.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
24. 24.True or false: to leave fridge door open saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
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 8 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
32. 32.True or false: to use daylight to read saves electricity. (a) False (b) True
33. 33.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) switch off empty rooms (d) use daylight to read
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) close the fridge quickly
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
39. 39.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby

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