Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 673 · 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 daylight to read? (a) saves electricity (b) wastes electricity
2. 2.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
6. 6.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
12. 12.True or false: to leave the TV on standby saves electricity. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
14. 14.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
16. 16.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.True or false: to use old filament bulbs saves electricity. (a) True (b) False
18. 18.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) unplug idle chargers
20. 20.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
26. 26.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
27. 27.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
28. 28.True or false: to leave fridge door open wastes electricity. (a) True (b) False
29. 29.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
32. 32.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
33. 33.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
36. 36.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) set the AC to 24 °C
40. 40.True or false: to unplug idle chargers wastes electricity. (a) False (b) True

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