Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 389 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
3. 3.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
5. 5.True or false: to switch off empty rooms saves electricity. (a) True (b) False
6. 6.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 8 hours. How many watt-hours (Wh) are saved?
11. 11.True or false: to use daylight to read saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
14. 14.True or false: to use old filament bulbs saves electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
16. 16.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
28. 28.True or false: to unplug idle chargers saves electricity. (a) False (b) True
29. 29.True or false: to use LED lamps wastes electricity. (a) False (b) True
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) unplug idle chargers (d) set the AC to 24 °C
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
32. 32.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
36. 36.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) unplug idle chargers
39. 39.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
40. 40.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) use daylight to read (d) use LED lamps

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