Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 18 · 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 of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
3. 3.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
4. 4.True or false: to use LED lamps saves electricity. (a) True (b) False
5. 5.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
10. 10.🧾 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?
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
13. 13.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
17. 17.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
19. 19.True or false: to leave fridge door open saves electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
21. 21.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) close the fridge quickly
25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
27. 27.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to leave fridge door open wastes electricity. (a) True (b) False
32. 32.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.True or false: to close the fridge quickly saves electricity. (a) False (b) True
35. 35.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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