Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 319 · 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 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
5. 5.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
7. 7.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
9. 9.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) run fans in empty rooms
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
19. 19.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
21. 21.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
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 8 hours. How many watt-hours (Wh) are saved?
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) run fans in empty rooms (d) close the fridge quickly
26. 26.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) leave fridge door open
31. 31.🧾 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?
32. 32.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
38. 38.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

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