Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 573 · 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 family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
5. 5.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
7. 7.True or false: to use LED lamps saves electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
9. 9.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
10. 10.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
16. 16.🧾 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?
17. 17.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
18. 18.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
20. 20.True or false: to use LED lamps wastes electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
22. 22.True or false: to leave fridge door open wastes electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
24. 24.True or false: to leave the TV on standby saves electricity. (a) False (b) True
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
26. 26.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
31. 31.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 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?
35. 35.🧾 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?
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
39. 39.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms

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