Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 758 · 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 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.True or false: to leave fridge door open saves electricity. (a) False (b) True
4. 4.True or false: to close the fridge quickly saves electricity. (a) False (b) True
5. 5.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
6. 6.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
13. 13.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
15. 15.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) iron one shirt at a time (d) use daylight to read
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
32. 32.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
40. 40.🧾 A 50 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