Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 465 · 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.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) leave the TV on standby
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
5. 5.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
7. 7.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
10. 10.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.🧾 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?
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
14. 14.True or false: to use LED lamps saves electricity. (a) False (b) True
15. 15.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) close the fridge quickly
21. 21.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
23. 23.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
24. 24.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
33. 33.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
34. 34.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
36. 36.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
40. 40.True or false: to leave fridge door open saves electricity. (a) True (b) False

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