Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 602 · 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) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) iron one shirt at a time
4. 4.🧾 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
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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 10 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
15. 15.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
20. 20.True or false: to switch off empty rooms saves electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
23. 23.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.🔍 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) close the fridge quickly
25. 25.True or false: to unplug idle chargers saves electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
27. 27.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
34. 34.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
37. 37.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) switch off empty rooms
39. 39.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🧾 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?

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