Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 135 · 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 of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
2. 2.🧾 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?
3. 3.True or false: to use LED lamps saves electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
6. 6.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
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 7 hours. How many watt-hours (Wh) are saved?
11. 11.True or false: to use daylight to read wastes electricity. (a) True (b) False
12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
16. 16.True or false: to use old filament bulbs saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) use LED lamps
23. 23.True or false: to leave fridge door open wastes electricity. (a) False (b) True
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
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 10 hours. How many watt-hours (Wh) are saved?
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
31. 31.🧾 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?
32. 32.Which of these saves electricity? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
33. 33.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
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 8 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 8 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to leave the TV on standby saves electricity. (a) False (b) True
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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