Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 784 · 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 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?
2. 2.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) unplug idle chargers
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) close the fridge quickly
7. 7.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.True or false: to use daylight to read saves electricity. (a) True (b) False
11. 11.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
18. 18.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
19. 19.True or false: to leave fridge door open wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.🔍 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
22. 22.🧾 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?
23. 23.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
29. 29.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
30. 30.True or false: to use LED lamps saves electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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