Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 143 · 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) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
2. 2.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
11. 11.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
13. 13.🧾 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?
14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
19. 19.True or false: to use LED lamps saves electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
22. 22.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
23. 23.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use LED lamps (d) use daylight to read
25. 25.🧾 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?
26. 26.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
27. 27.True or false: to use old filament bulbs saves electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
31. 31.🧾 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?
32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
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 4 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
38. 38.True or false: to switch off empty rooms saves electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
40. 40.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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