Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 569 · 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.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
5. 5.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
6. 6.True or false: to close the fridge quickly saves electricity. (a) False (b) True
7. 7.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) set the AC to 24 °C
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) set the AC to 24 °C (d) use LED lamps
15. 15.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) run fans in empty rooms (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
19. 19.True or false: to unplug idle chargers saves electricity. (a) True (b) False
20. 20.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) leave fridge door open
22. 22.True or false: to leave the TV on standby saves electricity. (a) False (b) True
23. 23.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 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?
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
26. 26.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) close the fridge quickly
27. 27.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
29. 29.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
36. 36.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers
38. 38.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
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 9 hours. How many watt-hours (Wh) are saved?

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