Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 224 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
3. 3.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
5. 5.True or false: to use LED lamps wastes electricity. (a) False (b) True
6. 6.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) use LED lamps (d) set the AC to 24 °C
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) iron one shirt at a time
9. 9.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
13. 13.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to leave the TV on standby saves electricity. (a) True (b) False
17. 17.True or false: to leave fridge door open wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.🧾 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?
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
28. 28.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
32. 32.🧾 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?
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
34. 34.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
35. 35.🧾 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?
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
37. 37.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 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?
39. 39.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.True or false: to use old filament bulbs saves electricity. (a) True (b) False

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