Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 92 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
3. 3.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
6. 6.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
7. 7.🧾 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?
8. 8.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
11. 11.🧾 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?
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
13. 13.🧾 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?
14. 14.🧾 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?
15. 15.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
19. 19.True or false: to use LED lamps saves electricity. (a) False (b) True
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.True or false: to use LED lamps wastes electricity. (a) False (b) True
22. 22.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
23. 23.True or false: to use daylight to read wastes electricity. (a) False (b) True
24. 24.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
27. 27.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
29. 29.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
31. 31.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) use LED lamps
35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
36. 36.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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