Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 31 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
11. 11.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
13. 13.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
16. 16.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
17. 17.True or false: to use daylight to read wastes electricity. (a) True (b) False
18. 18.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 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?
21. 21.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) switch off empty rooms
22. 22.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
25. 25.True or false: to use old filament bulbs saves electricity. (a) True (b) False
26. 26.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) unplug idle chargers (d) switch off empty rooms
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
28. 28.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.True or false: to use LED lamps wastes electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
36. 36.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
38. 38.True or false: to leave fridge door open saves electricity. (a) True (b) False
39. 39.True or false: to unplug idle chargers saves electricity. (a) False (b) True
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

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