Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 951 · 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 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to leave fridge door open wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
7. 7.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
8. 8.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
10. 10.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
11. 11.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
12. 12.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
13. 13.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
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 7 hours. How many watt-hours (Wh) are saved?
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🧾 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?
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
19. 19.True or false: to use LED lamps saves electricity. (a) False (b) True
20. 20.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🧾 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?
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.True or false: to leave the TV on standby saves electricity. (a) True (b) False
30. 30.True or false: to switch off empty rooms saves electricity. (a) True (b) False
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
33. 33.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
35. 35.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
37. 37.🧾 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?
38. 38.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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