Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 357 · 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 leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 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?
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
5. 5.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
7. 7.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
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 10 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
17. 17.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) close the fridge quickly
20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
25. 25.🧾 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?
26. 26.🧾 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?
27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
29. 29.True or false: to use old filament bulbs saves electricity. (a) True (b) False
30. 30.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
35. 35.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 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?
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) run fans in empty rooms
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use LED lamps

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