Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 587 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
3. 3.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
5. 5.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to use daylight to read saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
12. 12.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
15. 15.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
19. 19.True or false: to use LED lamps saves electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
22. 22.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
23. 23.🧾 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?
24. 24.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
26. 26.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
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 8 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
30. 30.True or false: to leave fridge door open saves electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
32. 32.True or false: to use daylight to read wastes electricity. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
35. 35.True or false: to switch off empty rooms saves electricity. (a) True (b) False
36. 36.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
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 8 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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