Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 336 · 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 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
4. 4.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
6. 6.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.True or false: to use LED lamps saves electricity. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) set the AC to 24 °C
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
16. 16.🧾 A family uses 20 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) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.True or false: to use old filament bulbs saves electricity. (a) True (b) False
24. 24.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
30. 30.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
35. 35.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
40. 40.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs

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