Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 318 · 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 is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
3. 3.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.🧾 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?
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
13. 13.True or false: to close the fridge quickly saves electricity. (a) False (b) True
14. 14.True or false: to unplug idle chargers saves electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
16. 16.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
18. 18.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) unplug idle chargers
19. 19.🧾 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?
20. 20.True or false: to switch off empty rooms saves electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) close the fridge quickly
22. 22.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
24. 24.True or false: to use daylight to read wastes electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
29. 29.🧾 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?
30. 30.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
32. 32.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
34. 34.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
38. 38.🧾 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?
39. 39.🧾 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?
40. 40.True or false: to use daylight to read saves electricity. (a) True (b) False

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