Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 374 · 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 wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
2. 2.True or false: to leave fridge door open wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
11. 11.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
14. 14.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to use old filament bulbs saves electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
17. 17.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
20. 20.True or false: to unplug idle chargers saves electricity. (a) True (b) False
21. 21.True or false: to use LED lamps saves electricity. (a) False (b) True
22. 22.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
28. 28.True or false: to use daylight to read saves electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
30. 30.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
34. 34.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
36. 36.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
37. 37.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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