Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 13 · 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 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?
2. 2.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
5. 5.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
10. 10.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
11. 11.True or false: to use daylight to read wastes electricity. (a) False (b) True
12. 12.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) set the AC to 24 °C
14. 14.🧾 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?
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
22. 22.True or false: to use LED lamps saves electricity. (a) True (b) False
23. 23.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
34. 34.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
39. 39.True or false: to leave fridge door open saves electricity. (a) False (b) True
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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