Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 372 · 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.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
3. 3.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
8. 8.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
10. 10.🧾 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?
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
12. 12.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to use LED lamps saves electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
19. 19.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
20. 20.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
23. 23.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
28. 28.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
29. 29.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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