Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 679 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
2. 2.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
3. 3.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
5. 5.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
8. 8.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
9. 9.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
11. 11.🧾 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?
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) use LED lamps (d) set the AC to 24 °C
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
14. 14.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.True or false: to use daylight to read wastes electricity. (a) True (b) False
16. 16.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to use LED lamps saves electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
22. 22.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to leave fridge door open saves electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
25. 25.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
28. 28.True or false: to leave the TV on standby saves electricity. (a) True (b) False
29. 29.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) set the AC to 24 °C (d) switch off empty rooms
30. 30.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
32. 32.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
34. 34.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time

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