Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 80 · 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 close the fridge quickly? (a) saves electricity (b) wastes electricity
2. 2.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.True or false: to use LED lamps wastes electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
9. 9.🧾 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?
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
11. 11.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
12. 12.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.True or false: to leave fridge door open saves electricity. (a) False (b) True
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
16. 16.🧾 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
17. 17.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
21. 21.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) set the AC to 24 °C
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
28. 28.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) switch off empty rooms (d) close the fridge quickly
31. 31.🧾 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?
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
34. 34.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
37. 37.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
39. 39.True or false: to leave the TV on standby saves electricity. (a) False (b) True
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms

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