Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 296 · 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.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) use daylight to read
3. 3.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
12. 12.True or false: to use daylight to read saves electricity. (a) False (b) True
13. 13.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
16. 16.🧾 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?
17. 17.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
19. 19.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
23. 23.🧾 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?
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
25. 25.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) switch off empty rooms (d) use LED lamps
26. 26.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.True or false: to use daylight to read wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
30. 30.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
31. 31.True or false: to use old filament bulbs saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read

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