Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 412 · 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.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.🧾 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?
5. 5.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
10. 10.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.True or false: to leave fridge door open wastes electricity. (a) False (b) True
12. 12.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 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?
14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
15. 15.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
18. 18.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
19. 19.True or false: to use daylight to read wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) set the AC to 24 °C (d) use daylight to read
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
23. 23.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
26. 26.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use daylight to read (d) close the fridge quickly
29. 29.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
32. 32.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
35. 35.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity

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