Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 743 · 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 is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) set the AC to 24 °C
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
3. 3.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
4. 4.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
9. 9.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
10. 10.True or false: to use daylight to read wastes electricity. (a) False (b) True
11. 11.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
13. 13.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
14. 14.🧾 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?
15. 15.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
17. 17.True or false: to leave the TV on standby saves electricity. (a) False (b) True
18. 18.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
23. 23.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
30. 30.🧾 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?
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
36. 36.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
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 2 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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