Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 9 · 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 leave the TV on standby wastes electricity. (a) False (b) True
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
3. 3.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
5. 5.🧾 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?
6. 6.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
8. 8.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
10. 10.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
13. 13.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to leave the TV on standby saves electricity. (a) False (b) True
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🧾 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?
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
28. 28.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
30. 30.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
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 2 hours. How many watt-hours (Wh) are saved?
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use daylight to read (d) run fans in empty rooms
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
36. 36.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
39. 39.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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