Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 574 · 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.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
3. 3.🧾 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?
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
5. 5.True or false: to use daylight to read saves electricity. (a) True (b) False
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
9. 9.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
15. 15.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
18. 18.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
21. 21.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
24. 24.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) switch off empty rooms (d) unplug idle chargers
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
26. 26.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) close the fridge quickly
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
28. 28.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) leave the TV on standby
33. 33.True or false: to leave the TV on standby saves electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
35. 35.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
36. 36.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.True or false: to use daylight to read wastes electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) leave the TV on standby
40. 40.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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