Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 624 · 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) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) use LED lamps
2. 2.True or false: to leave fridge door open wastes electricity. (a) False (b) True
3. 3.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use daylight to read (d) close the fridge quickly
4. 4.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
10. 10.True or false: to switch off empty rooms saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.🔍 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
16. 16.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) close the fridge quickly (d) use LED lamps
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
23. 23.True or false: to use LED lamps saves electricity. (a) True (b) False
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.True or false: to use daylight to read saves electricity. (a) False (b) True
27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
29. 29.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
31. 31.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
32. 32.🧾 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
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
36. 36.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
38. 38.🔍 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 daylight to read
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
40. 40.🧾 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?

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