Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 906 · 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.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) switch off empty rooms
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
3. 3.True or false: to close the fridge quickly saves electricity. (a) True (b) False
4. 4.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
6. 6.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
10. 10.True or false: to use LED lamps saves electricity. (a) False (b) True
11. 11.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
12. 12.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to use daylight to read wastes electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) unplug idle chargers
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) use LED lamps
16. 16.True or false: to use LED lamps wastes electricity. (a) False (b) True
17. 17.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
21. 21.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
24. 24.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
26. 26.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
31. 31.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
34. 34.🧾 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?
35. 35.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to unplug idle chargers saves electricity. (a) False (b) True
37. 37.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
38. 38.🧾 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?
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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