Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 276 · 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.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
2. 2.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
3. 3.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
8. 8.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
12. 12.True or false: to use daylight to read wastes electricity. (a) True (b) False
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
19. 19.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to close the fridge quickly saves electricity. (a) True (b) False
21. 21.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
22. 22.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to leave fridge door open wastes electricity. (a) True (b) False
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
32. 32.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
33. 33.🧾 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
34. 34.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
37. 37.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) use LED lamps

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