Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 596 · 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 the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
3. 3.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
4. 4.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
8. 8.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
10. 10.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) iron one shirt at a time
11. 11.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) leave fridge door open
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
14. 14.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
16. 16.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
18. 18.💡 Does it save or waste electricity to use LED lamps? (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 leave the TV on standby wastes electricity. (a) True (b) False
21. 21.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
25. 25.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) switch off empty rooms
31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
32. 32.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
33. 33.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
35. 35.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
37. 37.True or false: to use LED lamps saves electricity. (a) True (b) False
38. 38.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
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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