Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 693 · 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 lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use daylight to read (d) use LED lamps
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
5. 5.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
6. 6.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
8. 8.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
15. 15.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
18. 18.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
19. 19.True or false: to use old filament bulbs saves electricity. (a) False (b) True
20. 20.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
21. 21.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
24. 24.True or false: to switch off empty rooms saves electricity. (a) False (b) True
25. 25.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
31. 31.True or false: to leave fridge door open wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.🧾 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?
35. 35.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
37. 37.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
39. 39.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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