Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 956 · 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 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?
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
3. 3.True or false: to switch off empty rooms saves 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 3 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
7. 7.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use old filament bulbs saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
12. 12.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
14. 14.🧾 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?
15. 15.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) use old filament bulbs
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
21. 21.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
23. 23.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
26. 26.🧾 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?
27. 27.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
31. 31.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
32. 32.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
34. 34.True or false: to leave fridge door open saves electricity. (a) True (b) False
35. 35.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?

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