Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 548 · 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) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
2. 2.True or false: to use old filament bulbs saves electricity. (a) True (b) False
3. 3.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
5. 5.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) switch off empty rooms (d) use daylight to read
10. 10.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
14. 14.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
17. 17.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.True or false: to use LED lamps wastes electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
23. 23.True or false: to use LED lamps saves electricity. (a) True (b) False
24. 24.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) close the fridge quickly (d) set the AC to 24 °C
29. 29.True or false: to close the fridge quickly saves electricity. (a) True (b) False
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
33. 33.🧾 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?
34. 34.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
35. 35.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
39. 39.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers

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