Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 586 · 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 is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
7. 7.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) run fans in empty rooms
9. 9.True or false: to leave fridge door open wastes electricity. (a) False (b) True
10. 10.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) set the AC to 24 °C
11. 11.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
13. 13.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.🧾 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?
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
21. 21.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
27. 27.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
32. 32.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
34. 34.True or false: to switch off empty rooms saves electricity. (a) False (b) True
35. 35.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
37. 37.🧾 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?
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
40. 40.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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