Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 953 · 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.True or false: to use daylight to read wastes electricity. (a) True (b) False
2. 2.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
5. 5.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
8. 8.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to leave the TV on standby saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
13. 13.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to leave fridge door open saves electricity. (a) False (b) True
16. 16.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
22. 22.🔍 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) unplug idle chargers
23. 23.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) use LED lamps
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
26. 26.True or false: to leave fridge door open wastes electricity. (a) True (b) False
27. 27.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
31. 31.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
32. 32.True or false: to use LED lamps saves electricity. (a) False (b) True
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
34. 34.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
39. 39.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C

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