Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 325 · 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.True or false: to use LED lamps saves electricity. (a) False (b) True
2. 2.True or false: to switch off empty rooms saves electricity. (a) False (b) True
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
13. 13.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
15. 15.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) switch off empty rooms
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
23. 23.🧾 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?
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
25. 25.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
26. 26.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
29. 29.True or false: to use daylight to read wastes electricity. (a) False (b) True
30. 30.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
35. 35.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
37. 37.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to use LED lamps wastes electricity. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time

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