Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 397 · 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 run fans in empty rooms? (a) saves electricity (b) wastes electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
4. 4.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
5. 5.True or false: to use daylight to read saves electricity. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
7. 7.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
10. 10.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
11. 11.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
13. 13.🧾 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?
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
15. 15.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
17. 17.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
24. 24.True or false: to leave the TV on standby saves electricity. (a) True (b) False
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.True or false: to leave fridge door open wastes electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
32. 32.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
39. 39.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) set the AC to 24 °C

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