Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 837 · 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 of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
4. 4.True or false: to leave the TV on standby saves electricity. (a) True (b) False
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
6. 6.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
8. 8.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
13. 13.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
20. 20.True or false: to leave fridge door open wastes electricity. (a) True (b) False
21. 21.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 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?
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
26. 26.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
28. 28.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
29. 29.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
33. 33.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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