Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 256 · 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 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
3. 3.🔍 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) leave the TV on standby
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
5. 5.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
9. 9.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
13. 13.🧾 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
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
17. 17.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
18. 18.True or false: to switch off empty rooms saves electricity. (a) True (b) False
19. 19.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
20. 20.🧾 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?
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
22. 22.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
23. 23.True or false: to unplug idle chargers saves electricity. (a) True (b) False
24. 24.🧾 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?
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
26. 26.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.🧾 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?
28. 28.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
29. 29.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) use old filament bulbs
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
34. 34.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to use LED lamps saves electricity. (a) False (b) True
36. 36.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
37. 37.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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