Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 504 · 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 of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) use old filament bulbs
2. 2.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) close the fridge quickly (d) unplug idle chargers
3. 3.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.True or false: to leave fridge door open wastes electricity. (a) True (b) False
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
8. 8.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) switch off empty rooms
9. 9.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) unplug idle chargers (d) use daylight to read
11. 11.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
17. 17.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
18. 18.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
21. 21.True or false: to unplug idle chargers saves electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
23. 23.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
25. 25.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
27. 27.True or false: to use LED lamps wastes electricity. (a) False (b) True
28. 28.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
33. 33.True or false: to leave fridge door open saves electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
37. 37.🧾 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?
38. 38.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?

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