Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 793 · 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.🧾 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?
2. 2.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
5. 5.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
7. 7.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
9. 9.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
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 8 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
14. 14.True or false: to use LED lamps wastes electricity. (a) False (b) True
15. 15.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
19. 19.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
22. 22.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
23. 23.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
24. 24.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
28. 28.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) set the AC to 24 °C
30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) close the fridge quickly
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
33. 33.🧾 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?
34. 34.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps
35. 35.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.🧾 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?
37. 37.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 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?
39. 39.True or false: to leave the TV on standby saves electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) unplug idle chargers (d) set the AC to 24 °C

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