Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 381 · 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 lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
2. 2.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
4. 4.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) switch off empty rooms
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
8. 8.True or false: to leave the TV on standby saves electricity. (a) True (b) False
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🧾 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?
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.🧾 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?
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
17. 17.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.True or false: to use old filament bulbs saves electricity. (a) False (b) True
20. 20.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
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 10 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.True or false: to use LED lamps saves electricity. (a) False (b) True
26. 26.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
30. 30.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
32. 32.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
33. 33.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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