Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 65 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
5. 5.True or false: to leave the TV on standby saves electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 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.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
11. 11.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) iron one shirt at a time
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
18. 18.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to use old filament bulbs saves electricity. (a) True (b) False
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.True or false: to close the fridge quickly saves electricity. (a) True (b) False
27. 27.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time
29. 29.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
31. 31.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
34. 34.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
35. 35.True or false: to use LED lamps saves electricity. (a) True (b) False
36. 36.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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