Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 410 · 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.True or false: to use old filament bulbs saves electricity. (a) True (b) False
2. 2.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
4. 4.True or false: to use LED lamps saves electricity. (a) False (b) True
5. 5.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
8. 8.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
9. 9.True or false: to unplug idle chargers saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
11. 11.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
13. 13.🧾 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
14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
15. 15.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
16. 16.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
19. 19.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
25. 25.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
26. 26.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
28. 28.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
30. 30.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
33. 33.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
34. 34.🧾 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?
35. 35.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
39. 39.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.True or false: to close the fridge quickly saves electricity. (a) True (b) False

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