Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 315 · 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 saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
2. 2.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
3. 3.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) set the AC to 24 °C
5. 5.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
6. 6.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.True or false: to switch off empty rooms saves electricity. (a) False (b) True
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
13. 13.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
17. 17.True or false: to leave fridge door open wastes electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
24. 24.🧾 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?
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.True or false: to use daylight to read saves electricity. (a) True (b) False
30. 30.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
31. 31.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
32. 32.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
33. 33.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 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?
36. 36.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) close the fridge quickly
39. 39.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C

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