Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 380 · 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 of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use old filament bulbs (d) unplug idle chargers
2. 2.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.🧾 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?
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
6. 6.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
8. 8.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
15. 15.True or false: to use LED lamps wastes electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) close the fridge quickly (d) switch off empty rooms
17. 17.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
21. 21.🧾 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?
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
25. 25.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
26. 26.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
34. 34.True or false: to leave fridge door open saves electricity. (a) False (b) True
35. 35.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
37. 37.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
38. 38.🧾 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?
39. 39.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids