Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 527 · 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 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
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 3 hours. How many watt-hours (Wh) are saved?
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs
5. 5.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
8. 8.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
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 5 hours. How many watt-hours (Wh) are saved?
16. 16.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs
18. 18.🧾 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
19. 19.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
21. 21.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
22. 22.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
29. 29.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use daylight to read
30. 30.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
31. 31.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) leave fridge door open
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) use old filament bulbs (d) switch off empty rooms
35. 35.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) leave fridge door open
36. 36.🧾 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?
37. 37.🧾 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?
38. 38.True or false: to use LED lamps saves electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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