Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 878 · 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 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.True or false: to unplug idle chargers saves electricity. (a) True (b) False
3. 3.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
8. 8.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.True or false: to use old filament bulbs saves electricity. (a) True (b) False
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
13. 13.True or false: to switch off empty rooms saves electricity. (a) False (b) True
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.True or false: to leave fridge door open wastes electricity. (a) False (b) True
16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use LED lamps (d) switch off empty rooms
19. 19.🧾 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?
20. 20.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) set the AC to 24 °C
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
24. 24.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) use old filament bulbs
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🧾 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?
28. 28.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) leave the TV on standby
29. 29.🧾 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?
30. 30.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
31. 31.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
33. 33.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
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 3 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
37. 37.🧾 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?
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

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