Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 422 · 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 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?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
3. 3.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
6. 6.🧾 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?
7. 7.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 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?
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
10. 10.True or false: to use LED lamps saves electricity. (a) False (b) True
11. 11.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
12. 12.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
17. 17.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
19. 19.True or false: to switch off empty rooms saves electricity. (a) True (b) False
20. 20.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to use old filament bulbs saves electricity. (a) False (b) True
22. 22.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
23. 23.🧾 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?
24. 24.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 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?
33. 33.🧾 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?
34. 34.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
39. 39.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms

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