Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 954 · 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) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
4. 4.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
8. 8.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
10. 10.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
12. 12.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) use LED lamps
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
16. 16.True or false: to close the fridge quickly saves electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
18. 18.True or false: to leave the TV on standby saves electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
20. 20.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) set the AC to 24 °C
22. 22.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) iron one shirt at a time
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.🧾 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
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to leave fridge door open wastes electricity. (a) False (b) True
31. 31.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
32. 32.🧾 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?
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
35. 35.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to switch off empty rooms saves electricity. (a) True (b) False
37. 37.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
38. 38.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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