Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 342 · 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 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
2. 2.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
4. 4.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
5. 5.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
6. 6.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
8. 8.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
9. 9.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
10. 10.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) leave fridge door open (d) iron one shirt at a time
12. 12.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 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?
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
20. 20.True or false: to close the fridge quickly saves electricity. (a) True (b) False
21. 21.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
26. 26.True or false: to leave the TV on standby saves electricity. (a) False (b) True
27. 27.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
28. 28.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
29. 29.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
31. 31.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
32. 32.True or false: to use daylight to read wastes electricity. (a) True (b) False
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) leave fridge door open (d) set the AC to 24 °C
39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?

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