Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 120 · 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 is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
2. 2.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
5. 5.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
6. 6.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
10. 10.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.True or false: to use old filament bulbs saves electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
15. 15.True or false: to use LED lamps wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.True or false: to leave fridge door open saves electricity. (a) True (b) False
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
21. 21.True or false: to use daylight to read saves electricity. (a) True (b) False
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 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?
26. 26.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
28. 28.🧾 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?
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
38. 38.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
39. 39.True or false: to use LED lamps saves electricity. (a) False (b) True
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity

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