Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 117 · 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) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
4. 4.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
8. 8.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
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 1 hour. How many watt-hours (Wh) are saved?
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
12. 12.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
14. 14.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
16. 16.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
22. 22.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
23. 23.True or false: to unplug idle chargers saves electricity. (a) False (b) True
24. 24.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
27. 27.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) switch off empty rooms
28. 28.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🧾 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?
31. 31.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to use LED lamps saves electricity. (a) False (b) True
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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