Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 396 · 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.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
3. 3.🧾 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
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
5. 5.🧾 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?
6. 6.🧾 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?
7. 7.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) set the AC to 24 °C
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
11. 11.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
14. 14.🧾 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?
15. 15.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
17. 17.True or false: to unplug idle chargers saves electricity. (a) True (b) False
18. 18.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
21. 21.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
23. 23.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
24. 24.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
26. 26.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
29. 29.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
30. 30.True or false: to leave fridge door open wastes electricity. (a) True (b) False
31. 31.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) iron one shirt at a time
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🔍 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
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
37. 37.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
38. 38.🔍 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
39. 39.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open

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