Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 327 · 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.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
5. 5.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) close the fridge quickly
7. 7.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) close the fridge quickly
8. 8.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
9. 9.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
11. 11.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
16. 16.True or false: to leave fridge door open saves electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
18. 18.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
23. 23.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
24. 24.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
34. 34.True or false: to unplug idle chargers saves electricity. (a) False (b) True
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
37. 37.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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