Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 411 · 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.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
3. 3.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
5. 5.🧾 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?
6. 6.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
8. 8.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use LED lamps (d) use daylight to read
13. 13.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) unplug idle chargers
22. 22.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
27. 27.True or false: to use LED lamps wastes electricity. (a) False (b) True
28. 28.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
33. 33.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
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 family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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