Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 207 · 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) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) close the fridge quickly
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
10. 10.True or false: to unplug idle chargers saves electricity. (a) True (b) False
11. 11.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) set the AC to 24 °C
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
17. 17.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) iron one shirt at a time (d) use LED lamps
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
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 8 hours. How many watt-hours (Wh) are saved?
20. 20.True or false: to leave fridge door open saves electricity. (a) True (b) False
21. 21.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
22. 22.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
23. 23.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
24. 24.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) switch off empty rooms
30. 30.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
31. 31.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to leave the TV on standby saves electricity. (a) True (b) False
35. 35.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
36. 36.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.True or false: to use old filament bulbs saves electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) leave the TV on standby
40. 40.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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