Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 392 · 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 family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
3. 3.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
4. 4.🧾 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?
5. 5.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.True or false: to leave the TV on standby saves electricity. (a) True (b) False
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
10. 10.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) use old filament bulbs
13. 13.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 5 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
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 5 hours. How many watt-hours (Wh) are saved?
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
23. 23.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
24. 24.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
25. 25.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
29. 29.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to leave fridge door open wastes electricity. (a) True (b) False
37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
38. 38.True or false: to use LED lamps wastes electricity. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open

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