Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 668 · 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 set the AC to 24 °C? (a) saves electricity (b) wastes electricity
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
5. 5.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
11. 11.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
13. 13.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
17. 17.True or false: to unplug idle chargers saves electricity. (a) True (b) False
18. 18.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
22. 22.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
23. 23.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
28. 28.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
29. 29.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
33. 33.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
35. 35.🧾 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?
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
37. 37.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
39. 39.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby

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