Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 187 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
2. 2.🧾 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?
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
12. 12.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
14. 14.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
16. 16.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
19. 19.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
23. 23.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.True or false: to use daylight to read saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
27. 27.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
29. 29.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to use LED lamps wastes electricity. (a) True (b) False
31. 31.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
32. 32.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
35. 35.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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