Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 369 · 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 use LED lamps? (a) wastes electricity (b) saves electricity
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
5. 5.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
9. 9.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
14. 14.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
15. 15.True or false: to leave fridge door open wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) unplug idle chargers (d) close the fridge quickly
18. 18.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) set the AC to 24 °C (d) iron one shirt at a time
21. 21.True or false: to use LED lamps saves electricity. (a) True (b) False
22. 22.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
23. 23.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
26. 26.🧾 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?
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) run fans in empty rooms
29. 29.True or false: to use daylight to read saves electricity. (a) True (b) False
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
32. 32.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
33. 33.True or false: to close the fridge quickly saves electricity. (a) False (b) True
34. 34.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
35. 35.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
37. 37.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C

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