Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 331 · 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 fridge door open wastes electricity. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
3. 3.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
4. 4.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
6. 6.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
8. 8.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.True or false: to use LED lamps saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
13. 13.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 9 hours. How many watt-hours (Wh) are saved?
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
20. 20.Which of these wastes electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
21. 21.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
22. 22.🧾 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?
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) switch off empty rooms
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) use old filament bulbs
27. 27.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
31. 31.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
35. 35.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
39. 39.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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