Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 509 · 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.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
4. 4.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
6. 6.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
11. 11.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
13. 13.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) switch off empty rooms (d) set the AC to 24 °C
16. 16.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
18. 18.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
19. 19.True or false: to use daylight to read wastes electricity. (a) True (b) False
20. 20.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
21. 21.🧾 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?
22. 22.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
30. 30.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
31. 31.🔍 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
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
36. 36.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
38. 38.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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