Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 284 · 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 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?
2. 2.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
5. 5.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
9. 9.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
11. 11.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
19. 19.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
22. 22.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
27. 27.True or false: to use daylight to read wastes electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
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 1 hour. How many watt-hours (Wh) are saved?
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
37. 37.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
40. 40.🧾 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?

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