Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 255 · 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.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
3. 3.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) run fans in empty rooms
4. 4.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
5. 5.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
7. 7.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
8. 8.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
10. 10.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
11. 11.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
15. 15.🧾 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?
16. 16.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
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 10 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.True or false: to use LED lamps wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
21. 21.🧾 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?
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
30. 30.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
31. 31.🧾 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?
32. 32.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) use old filament bulbs
36. 36.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
40. 40.True or false: to leave the TV on standby saves electricity. (a) True (b) False

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