Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 513 · 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.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
4. 4.🧾 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?
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
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 2 hours. How many watt-hours (Wh) are saved?
7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
8. 8.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
10. 10.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
15. 15.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
17. 17.True or false: to close the fridge quickly saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
19. 19.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
24. 24.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) switch off empty rooms
28. 28.🧾 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?
29. 29.🧾 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?
30. 30.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
31. 31.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
33. 33.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
36. 36.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
40. 40.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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