Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 361 · 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 switch off empty rooms? (a) saves electricity (b) wastes electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
3. 3.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
5. 5.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
8. 8.True or false: to use LED lamps wastes electricity. (a) False (b) True
9. 9.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
13. 13.🧾 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?
14. 14.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
17. 17.🧾 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?
18. 18.🧾 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?
19. 19.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.True or false: to leave the TV on standby saves electricity. (a) False (b) True
22. 22.True or false: to unplug idle chargers saves electricity. (a) True (b) False
23. 23.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to use old filament bulbs saves electricity. (a) True (b) False
27. 27.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
29. 29.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
30. 30.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
37. 37.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
38. 38.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
40. 40.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C

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