Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 731 · 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 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
5. 5.🧾 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?
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
8. 8.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
10. 10.🔍 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) switch off empty rooms
11. 11.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) set the AC to 24 °C (d) use daylight to read
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
22. 22.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
24. 24.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
28. 28.🧾 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?
29. 29.🧾 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?
30. 30.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
34. 34.True or false: to use old filament bulbs saves electricity. (a) False (b) True
35. 35.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 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?
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
39. 39.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
40. 40.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly

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