Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 553 · 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 wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
2. 2.🧾 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?
3. 3.True or false: to switch off empty rooms saves electricity. (a) True (b) False
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
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 10 hours. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) switch off empty rooms
8. 8.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
9. 9.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
11. 11.🧾 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?
12. 12.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.True or false: to use daylight to read wastes electricity. (a) False (b) True
20. 20.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
29. 29.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
30. 30.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
34. 34.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) leave the TV on standby
38. 38.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.🧾 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?

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