Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 350 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
4. 4.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
6. 6.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.True or false: to use daylight to read wastes electricity. (a) True (b) False
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
17. 17.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.True or false: to use old filament bulbs saves electricity. (a) False (b) True
22. 22.True or false: to switch off empty rooms saves electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
24. 24.🧾 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?
25. 25.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
26. 26.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
29. 29.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
32. 32.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
37. 37.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
40. 40.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time

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