Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 814 · 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 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
2. 2.🧾 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?
3. 3.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
7. 7.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
8. 8.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) unplug idle chargers
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
13. 13.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
14. 14.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
15. 15.🧾 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?
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
18. 18.🧾 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?
19. 19.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
29. 29.True or false: to use daylight to read wastes electricity. (a) True (b) False
30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
36. 36.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
37. 37.True or false: to close the fridge quickly saves electricity. (a) False (b) True
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
39. 39.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity

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