Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 750 · 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 is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
2. 2.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
5. 5.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 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?
8. 8.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
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 10 hours. How many watt-hours (Wh) are saved?
12. 12.True or false: to leave the TV on standby saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.🧾 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
16. 16.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
19. 19.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
22. 22.🔍 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
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
34. 34.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) unplug idle chargers
35. 35.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
38. 38.True or false: to use old filament bulbs saves electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time

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