Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 737 · 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.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
4. 4.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
6. 6.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
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 2 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.True or false: to use LED lamps wastes electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
14. 14.True or false: to use daylight to read wastes electricity. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
17. 17.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
18. 18.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
20. 20.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
28. 28.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
29. 29.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
31. 31.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
32. 32.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
34. 34.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
40. 40.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs

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