Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 147 · 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 family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
4. 4.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
5. 5.True or false: to unplug idle chargers saves electricity. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
10. 10.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
15. 15.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) close the fridge quickly
18. 18.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
20. 20.True or false: to use LED lamps wastes electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
22. 22.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) close the fridge quickly (d) use LED lamps
23. 23.True or false: to leave fridge door open saves electricity. (a) True (b) False
24. 24.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
25. 25.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
27. 27.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
31. 31.🧾 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?
32. 32.True or false: to switch off empty rooms saves electricity. (a) True (b) False
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
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 leave fridge door open wastes electricity. (a) True (b) False
36. 36.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
39. 39.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 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) set the AC to 24 °C

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