Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 705 · 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 lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.True or false: to close the fridge quickly saves electricity. (a) True (b) False
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
8. 8.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) close the fridge quickly
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) close the fridge quickly
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) use LED lamps
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
19. 19.🧾 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?
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
21. 21.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to leave fridge door open wastes electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) set the AC to 24 °C
24. 24.True or false: to use LED lamps wastes electricity. (a) False (b) True
25. 25.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
34. 34.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
36. 36.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) run fans in empty rooms
37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
38. 38.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
39. 39.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby

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