Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 213 · 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) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
2. 2.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
3. 3.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) set the AC to 24 °C (d) use daylight to read
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
10. 10.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.True or false: to close the fridge quickly saves electricity. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
15. 15.True or false: to use old filament bulbs saves electricity. (a) False (b) True
16. 16.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) use LED lamps (d) close the fridge quickly
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
19. 19.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
20. 20.True or false: to leave the TV on standby saves electricity. (a) False (b) True
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
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 4 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
29. 29.True or false: to use daylight to read wastes electricity. (a) True (b) False
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.🧾 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?
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
35. 35.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps

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