Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 402 · 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 unplug idle chargers saves electricity. (a) True (b) False
2. 2.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
6. 6.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
12. 12.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
15. 15.🧾 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?
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
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 3 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
21. 21.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
23. 23.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
25. 25.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) close the fridge quickly (d) switch off empty rooms
26. 26.🧾 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?
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) set the AC to 24 °C
29. 29.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
36. 36.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
40. 40.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers

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