Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 632 · 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 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
7. 7.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
8. 8.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) iron one shirt at a time
9. 9.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
11. 11.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
13. 13.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
17. 17.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
19. 19.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
23. 23.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
24. 24.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
29. 29.True or false: to use old filament bulbs saves electricity. (a) True (b) False
30. 30.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
32. 32.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
34. 34.True or false: to leave fridge door open wastes electricity. (a) True (b) False
35. 35.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.True or false: to switch off empty rooms saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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