Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 498 · 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 is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) unplug idle chargers (d) set the AC to 24 °C
2. 2.🧾 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?
3. 3.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
7. 7.🧾 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?
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) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.🧾 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?
13. 13.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.True or false: to leave fridge door open wastes electricity. (a) False (b) True
19. 19.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
24. 24.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
26. 26.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
27. 27.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
28. 28.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
29. 29.True or false: to use daylight to read wastes electricity. (a) True (b) False
30. 30.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
32. 32.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
33. 33.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
34. 34.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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