Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 415 · 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 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
3. 3.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
5. 5.🧾 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
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) use daylight to read
7. 7.True or false: to leave fridge door open saves electricity. (a) True (b) False
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.🧾 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?
14. 14.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
16. 16.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
18. 18.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
21. 21.🧾 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?
22. 22.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.🧾 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?
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
27. 27.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
32. 32.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
36. 36.True or false: to use daylight to read saves electricity. (a) False (b) True
37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
38. 38.True or false: to leave fridge door open wastes electricity. (a) False (b) True
39. 39.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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 1 hour. How many watt-hours (Wh) are saved?

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