Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 575 · 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.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) run fans in empty rooms
2. 2.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
3. 3.True or false: to use LED lamps saves electricity. (a) False (b) True
4. 4.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) unplug idle chargers (d) set the AC to 24 °C
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
13. 13.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.🧾 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?
16. 16.True or false: to use daylight to read saves electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
18. 18.True or false: to switch off empty rooms saves electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) set the AC to 24 °C (d) use old filament bulbs
20. 20.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
26. 26.🔍 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) switch off empty rooms
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.True or false: to leave the TV on standby saves electricity. (a) True (b) False
32. 32.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
34. 34.🧾 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?
35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.True or false: to leave fridge door open saves electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
38. 38.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.True or false: to use daylight to read wastes electricity. (a) False (b) True
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?

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