Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 978 · 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.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
5. 5.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
8. 8.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
11. 11.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) leave fridge door open
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
17. 17.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
31. 31.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
34. 34.True or false: to use LED lamps saves electricity. (a) False (b) True
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
36. 36.🧾 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?
37. 37.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) use old filament bulbs
38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity

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