Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 473 · 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 run fans in empty rooms? (a) saves electricity (b) wastes electricity
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
3. 3.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
19. 19.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
22. 22.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
24. 24.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
31. 31.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
33. 33.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
35. 35.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
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
37. 37.True or false: to use old filament bulbs saves electricity. (a) True (b) False
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 4 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read

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