Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 697 · 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 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
2. 2.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) close the fridge quickly (d) unplug idle chargers
6. 6.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
7. 7.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
8. 8.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
18. 18.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) close the fridge quickly
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
23. 23.🧾 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?
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
25. 25.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
28. 28.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
30. 30.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
31. 31.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
32. 32.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
33. 33.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
37. 37.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) iron one shirt at a time
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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