Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 286 · 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 family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
4. 4.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
5. 5.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
9. 9.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
13. 13.True or false: to use LED lamps wastes electricity. (a) True (b) False
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
15. 15.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
17. 17.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
19. 19.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
21. 21.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
31. 31.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
32. 32.True or false: to leave fridge door open saves electricity. (a) True (b) False
33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
35. 35.🧾 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?
36. 36.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) close the fridge quickly
37. 37.🧾 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?
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.True or false: to leave the TV on standby saves electricity. (a) False (b) True

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