Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 460 · 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) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
3. 3.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
5. 5.🧾 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?
6. 6.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
9. 9.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
11. 11.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
13. 13.🧾 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?
14. 14.🧾 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?
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
16. 16.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
17. 17.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
22. 22.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to use LED lamps wastes electricity. (a) False (b) True
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
34. 34.True or false: to leave fridge door open wastes electricity. (a) True (b) False
35. 35.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) switch off empty rooms
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
40. 40.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms

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