Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 353 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
2. 2.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
3. 3.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
11. 11.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) switch off empty rooms
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
14. 14.True or false: to use LED lamps saves electricity. (a) True (b) False
15. 15.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
19. 19.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to leave fridge door open saves electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
27. 27.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to use LED lamps wastes electricity. (a) True (b) False
30. 30.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
32. 32.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
33. 33.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
35. 35.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
40. 40.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

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