Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 805 · 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 saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
2. 2.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
6. 6.True or false: to leave the TV on standby saves electricity. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use LED lamps
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
9. 9.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
12. 12.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.🧾 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
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
16. 16.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
22. 22.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
24. 24.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use LED lamps
25. 25.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
26. 26.True or false: to unplug idle chargers saves electricity. (a) False (b) True
27. 27.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
28. 28.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
33. 33.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
34. 34.True or false: to use old filament bulbs saves electricity. (a) False (b) True
35. 35.🧾 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?
36. 36.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
37. 37.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
39. 39.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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