Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 840 · 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.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
3. 3.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.True or false: to use old filament bulbs saves electricity. (a) True (b) False
5. 5.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) close the fridge quickly (d) use daylight to read
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) close the fridge quickly
8. 8.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
10. 10.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
11. 11.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
22. 22.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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 3 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
32. 32.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
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 saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
35. 35.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) close the fridge quickly (d) set the AC to 24 °C
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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