Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 610 · 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 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) unplug idle chargers
7. 7.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) switch off empty rooms
10. 10.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) leave fridge door open
13. 13.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🧾 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?
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
17. 17.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to use old filament bulbs saves electricity. (a) False (b) True
19. 19.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
22. 22.True or false: to use LED lamps wastes electricity. (a) True (b) False
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
24. 24.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
27. 27.🧾 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?
28. 28.True or false: to leave fridge door open saves electricity. (a) False (b) True
29. 29.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to switch off empty rooms saves electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) unplug idle chargers (d) close the fridge quickly
34. 34.🧾 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?
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.True or false: to unplug idle chargers saves electricity. (a) False (b) True
40. 40.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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