Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 94 · 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.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.True or false: to unplug idle chargers saves electricity. (a) True (b) False
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
13. 13.True or false: to use LED lamps wastes electricity. (a) True (b) False
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
15. 15.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
17. 17.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) set the AC to 24 °C (d) run fans in empty rooms
18. 18.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
20. 20.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
23. 23.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.True or false: to leave the TV on standby saves electricity. (a) False (b) True
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
29. 29.True or false: to use LED lamps saves electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) set the AC to 24 °C (d) iron one shirt at a time
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
32. 32.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
35. 35.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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