Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 243 · 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 use LED lamps? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.🧾 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?
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
11. 11.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
12. 12.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
15. 15.🧾 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?
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
17. 17.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
18. 18.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 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?
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) close the fridge quickly
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
26. 26.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.True or false: to leave fridge door open saves electricity. (a) False (b) True
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
30. 30.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to unplug idle chargers saves electricity. (a) False (b) True
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) use LED lamps (d) unplug idle chargers
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
35. 35.🧾 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?
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
39. 39.True or false: to use LED lamps saves electricity. (a) True (b) False
40. 40.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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