Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 664 · 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 of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
2. 2.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
3. 3.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
5. 5.🧾 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?
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
10. 10.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
12. 12.True or false: to close the fridge quickly saves electricity. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
16. 16.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
18. 18.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
20. 20.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
21. 21.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
25. 25.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) use LED lamps
29. 29.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 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?
32. 32.🧾 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?
33. 33.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
36. 36.🧾 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?
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave fridge door open
39. 39.🧾 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?
40. 40.True or false: to use old filament bulbs saves electricity. (a) True (b) False

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