Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 709 · 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 close the fridge quickly wastes electricity. (a) True (b) False
2. 2.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) switch off empty rooms
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) use daylight to read
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
9. 9.True or false: to use daylight to read wastes electricity. (a) False (b) True
10. 10.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 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?
17. 17.🧾 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?
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
23. 23.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
24. 24.🧾 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?
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
28. 28.True or false: to leave fridge door open saves electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) close the fridge quickly
31. 31.True or false: to unplug idle chargers saves electricity. (a) False (b) True
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) close the fridge quickly
36. 36.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
40. 40.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C

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