Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 790 · 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 7 hours. How many watt-hours (Wh) are saved?
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
4. 4.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
7. 7.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 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?
10. 10.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
12. 12.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
16. 16.True or false: to use LED lamps wastes electricity. (a) True (b) False
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
18. 18.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
19. 19.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
25. 25.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
26. 26.True or false: to switch off empty rooms saves electricity. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
28. 28.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
30. 30.Which of these saves electricity? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
32. 32.True or false: to use LED lamps saves electricity. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
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 4 hours. How many watt-hours (Wh) are saved?
35. 35.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
36. 36.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
37. 37.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
39. 39.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read

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