Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 577 · 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 old filament bulbs (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
2. 2.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
5. 5.🧾 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
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open
10. 10.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) run fans in empty rooms
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
20. 20.True or false: to use LED lamps wastes electricity. (a) True (b) False
21. 21.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
24. 24.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) use LED lamps
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
32. 32.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
34. 34.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
36. 36.True or false: to leave fridge door open wastes electricity. (a) True (b) False
37. 37.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
39. 39.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) unplug idle chargers

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