Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 603 · 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 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?
2. 2.True or false: to switch off empty rooms saves electricity. (a) True (b) False
3. 3.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
10. 10.🧾 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?
11. 11.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
17. 17.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
19. 19.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
22. 22.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
24. 24.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
29. 29.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
31. 31.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) run fans in empty rooms (d) switch off empty rooms
35. 35.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
36. 36.True or false: to unplug idle chargers saves electricity. (a) False (b) True
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 3 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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