Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 835 · 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 unplug idle chargers wastes electricity. (a) True (b) False
2. 2.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) close the fridge quickly
11. 11.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
14. 14.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) switch off empty rooms
15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
16. 16.True or false: to unplug idle chargers saves electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
18. 18.True or false: to close the fridge quickly saves electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
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 4 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) use daylight to read
26. 26.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
28. 28.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 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?
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
35. 35.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
37. 37.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
38. 38.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to leave the TV on standby saves electricity. (a) True (b) False
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby

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