Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 156 · 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) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
2. 2.🧾 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?
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
5. 5.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) leave the TV on standby
8. 8.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
9. 9.True or false: to leave the TV on standby saves electricity. (a) True (b) False
10. 10.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
15. 15.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
16. 16.🧾 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?
17. 17.🧾 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?
18. 18.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.True or false: to leave fridge door open saves electricity. (a) False (b) True
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
23. 23.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) switch off empty rooms
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
25. 25.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
27. 27.🧾 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?
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
31. 31.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
33. 33.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
34. 34.True or false: to use old filament bulbs saves electricity. (a) False (b) True
35. 35.True or false: to use LED lamps saves electricity. (a) False (b) True
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
37. 37.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
39. 39.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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