Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 398 · 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 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?
2. 2.True or false: to leave the TV on standby saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
6. 6.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
8. 8.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
16. 16.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to use LED lamps saves electricity. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
23. 23.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
25. 25.🧾 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?
26. 26.🧾 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?
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
33. 33.True or false: to use old filament bulbs saves electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
36. 36.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) use old filament bulbs
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

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