Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 406 · 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.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
5. 5.True or false: to switch off empty rooms saves electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
11. 11.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
14. 14.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
15. 15.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
18. 18.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
20. 20.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
21. 21.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
22. 22.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) switch off empty rooms (d) use daylight to read
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
24. 24.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 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?
29. 29.True or false: to use LED lamps saves electricity. (a) False (b) True
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
38. 38.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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