Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 658 · 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.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use old filament bulbs (d) leave the TV on standby
9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) unplug idle chargers
10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
12. 12.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
13. 13.True or false: to switch off empty rooms saves electricity. (a) True (b) False
14. 14.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
16. 16.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
17. 17.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) use daylight to read (d) use LED lamps
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
22. 22.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) close the fridge quickly (d) switch off empty rooms
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
31. 31.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) use daylight to read (d) use LED lamps
32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
37. 37.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
39. 39.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
40. 40.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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