Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 441 · 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 is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
4. 4.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
5. 5.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
7. 7.🔍 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) use daylight to read
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
9. 9.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
10. 10.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 60 W filament bulb is swapped for a 9 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 of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
15. 15.🧾 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?
16. 16.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
18. 18.🧾 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?
19. 19.True or false: to use LED lamps saves electricity. (a) False (b) True
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) iron one shirt at a time
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
26. 26.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
27. 27.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) use daylight to read (d) unplug idle chargers
31. 31.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 5 hours. How many watt-hours (Wh) are saved?
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
39. 39.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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