Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 476 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
2. 2.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
5. 5.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
6. 6.🧾 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?
7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
11. 11.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
14. 14.🧾 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
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
19. 19.True or false: to unplug idle chargers saves electricity. (a) False (b) True
20. 20.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
25. 25.True or false: to use LED lamps saves electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
27. 27.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) set the AC to 24 °C (d) switch off empty rooms
28. 28.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) iron one shirt at a time
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
35. 35.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
37. 37.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to switch off empty rooms saves electricity. (a) True (b) False

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