Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 879 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
3. 3.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
8. 8.🧾 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?
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to use old filament bulbs saves electricity. (a) False (b) True
12. 12.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
14. 14.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
15. 15.🧾 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?
16. 16.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
18. 18.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to leave fridge door open wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
21. 21.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
23. 23.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
25. 25.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) close the fridge quickly
33. 33.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
39. 39.True or false: to switch off empty rooms saves electricity. (a) False (b) True
40. 40.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open

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