Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 232 · 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 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) close the fridge quickly
3. 3.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
5. 5.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) close the fridge quickly
12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
13. 13.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
15. 15.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) unplug idle chargers
23. 23.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
25. 25.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
28. 28.🧾 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?
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
32. 32.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
37. 37.True or false: to use daylight to read saves electricity. (a) False (b) True
38. 38.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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