Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 454 · 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) iron one shirt at a time (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
4. 4.🧾 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?
5. 5.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
10. 10.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
11. 11.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 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?
13. 13.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
15. 15.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
17. 17.🧾 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?
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
19. 19.🧾 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?
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
23. 23.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
24. 24.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
25. 25.True or false: to use daylight to read saves electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
27. 27.True or false: to switch off empty rooms saves electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) leave fridge door open
31. 31.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) close the fridge quickly
37. 37.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
40. 40.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms

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