Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 15 · 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 unplug idle chargers? (a) saves electricity (b) wastes electricity
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
3. 3.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
5. 5.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) set the AC to 24 °C
6. 6.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
8. 8.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
9. 9.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
10. 10.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
13. 13.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
15. 15.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
20. 20.True or false: to close the fridge quickly saves electricity. (a) True (b) False
21. 21.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
30. 30.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
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 3 hours. How many watt-hours (Wh) are saved?
33. 33.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
34. 34.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) close the fridge quickly
38. 38.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
40. 40.True or false: to unplug idle chargers saves electricity. (a) False (b) True

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