Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 924 · 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.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) leave the TV on standby (d) use old filament bulbs
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
4. 4.🧾 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?
5. 5.True or false: to switch off empty rooms saves electricity. (a) True (b) False
6. 6.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
10. 10.True or false: to leave the TV on standby saves electricity. (a) True (b) False
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
15. 15.🧾 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
16. 16.🧾 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?
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
18. 18.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) iron one shirt at a time
20. 20.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to use daylight to read saves electricity. (a) True (b) False
22. 22.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
24. 24.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
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 8 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to unplug idle chargers saves electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
33. 33.🧾 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?
34. 34.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
35. 35.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.True or false: to leave fridge door open wastes electricity. (a) True (b) False
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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