Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 53 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
3. 3.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
6. 6.🧾 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?
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) set the AC to 24 °C
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
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 1 hour. How many watt-hours (Wh) are saved?
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) run fans in empty rooms
13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
18. 18.🧾 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?
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.True or false: to use old filament bulbs saves electricity. (a) False (b) True
22. 22.🧾 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?
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
31. 31.True or false: to leave fridge door open saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 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?
35. 35.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
37. 37.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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