Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 38 · 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) wastes electricity (b) saves electricity
2. 2.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 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?
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 6 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 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?
7. 7.True or false: to use old filament bulbs saves electricity. (a) False (b) True
8. 8.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
9. 9.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
11. 11.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
12. 12.True or false: to use LED lamps saves electricity. (a) True (b) False
13. 13.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) use old filament bulbs
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) iron one shirt at a time (d) use LED lamps
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
17. 17.True or false: to use daylight to read saves electricity. (a) True (b) False
18. 18.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
21. 21.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
23. 23.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
28. 28.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use LED lamps
33. 33.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
34. 34.🧾 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?
35. 35.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
37. 37.True or false: to leave the TV on standby saves electricity. (a) False (b) True
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
39. 39.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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