Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 416 · 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 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
8. 8.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) use old filament bulbs
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) leave fridge door open
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
15. 15.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
17. 17.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
18. 18.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
23. 23.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
28. 28.🔍 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
29. 29.🧾 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?
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
33. 33.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
35. 35.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🧾 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?
38. 38.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
39. 39.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to use LED lamps saves electricity. (a) False (b) True

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