Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 19 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
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 8 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
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.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) use daylight to read
18. 18.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
21. 21.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
22. 22.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
23. 23.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
27. 27.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
34. 34.True or false: to unplug idle chargers saves electricity. (a) True (b) False
35. 35.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use daylight to read (d) close the fridge quickly
37. 37.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.🧾 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?
40. 40.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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