Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 214 · 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.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
4. 4.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
5. 5.🧾 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?
6. 6.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) unplug idle chargers
8. 8.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) switch off empty rooms
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
11. 11.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.True or false: to leave the TV on standby saves electricity. (a) True (b) False
18. 18.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
24. 24.True or false: to use daylight to read wastes electricity. (a) False (b) True
25. 25.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
26. 26.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) use old filament bulbs
28. 28.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
29. 29.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
31. 31.🧾 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?
32. 32.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
33. 33.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?

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