Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 52 · 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) set the AC to 24 °C (b) use old filament bulbs (c) switch off empty rooms (d) use daylight to read
2. 2.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
3. 3.🧾 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?
4. 4.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
5. 5.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
6. 6.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) iron one shirt at a time
7. 7.🧾 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?
8. 8.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.🧾 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
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) use daylight to read
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
17. 17.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
21. 21.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
23. 23.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
25. 25.True or false: to use old filament bulbs saves electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
29. 29.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
30. 30.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) unplug idle chargers (d) close the fridge quickly
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 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?
35. 35.True or false: to leave the TV on standby saves electricity. (a) False (b) True
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity

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