Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 254 · 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 leave fridge door open saves electricity. (a) True (b) False
2. 2.True or false: to use daylight to read wastes electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
10. 10.True or false: to leave fridge door open wastes electricity. (a) True (b) False
11. 11.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
13. 13.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
14. 14.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
20. 20.🧾 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?
21. 21.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
23. 23.True or false: to switch off empty rooms saves electricity. (a) True (b) False
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
27. 27.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
30. 30.True or false: to use LED lamps wastes electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
36. 36.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) close the fridge quickly
38. 38.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 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?

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