Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 704 · 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 leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
3. 3.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) iron one shirt at a time
4. 4.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
6. 6.True or false: to use daylight to read wastes electricity. (a) True (b) False
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
9. 9.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
20. 20.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) run fans in empty rooms (d) close the fridge quickly
25. 25.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
26. 26.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 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?
29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
35. 35.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
36. 36.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
37. 37.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.True or false: to leave fridge door open wastes electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity

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