Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 812 · 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.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
2. 2.🧾 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?
3. 3.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to use old filament bulbs saves electricity. (a) True (b) False
5. 5.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
10. 10.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) leave the TV on standby
12. 12.🧾 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?
13. 13.🧾 A 500 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.True or false: to use LED lamps saves electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
21. 21.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
23. 23.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
26. 26.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use LED lamps
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) switch off empty rooms
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
31. 31.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
33. 33.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
34. 34.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
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 4 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) close the fridge quickly
40. 40.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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