Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 205 · 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) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) use daylight to read
5. 5.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
6. 6.🧾 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?
7. 7.True or false: to use old filament bulbs saves electricity. (a) False (b) True
8. 8.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
11. 11.True or false: to use daylight to read wastes electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 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?
15. 15.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
19. 19.True or false: to switch off empty rooms saves electricity. (a) False (b) True
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
21. 21.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
28. 28.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.🧾 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?
30. 30.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to leave fridge door open wastes electricity. (a) True (b) False
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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