Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 985 · 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.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) close the fridge quickly
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) leave the TV on standby
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
7. 7.🧾 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?
8. 8.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
11. 11.True or false: to leave the TV on standby saves electricity. (a) True (b) False
12. 12.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
14. 14.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to use LED lamps saves electricity. (a) False (b) True
16. 16.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
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 10 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to use daylight to read wastes electricity. (a) True (b) False
25. 25.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
26. 26.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) set the AC to 24 °C (d) use daylight to read
30. 30.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) use daylight to read
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
36. 36.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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