Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 6 · 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 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
3. 3.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
11. 11.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
12. 12.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
13. 13.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
15. 15.True or false: to use daylight to read saves electricity. (a) True (b) False
16. 16.🧾 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?
17. 17.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
21. 21.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) unplug idle chargers
23. 23.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
24. 24.🧾 A 75 W filament bulb is swapped for a 12 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 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
28. 28.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
29. 29.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
34. 34.🔍 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
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
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 9 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
39. 39.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read

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