Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 293 · 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 1 hour. How many watt-hours (Wh) are saved?
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
3. 3.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
8. 8.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) close the fridge quickly (d) use daylight to read
11. 11.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
14. 14.True or false: to leave fridge door open wastes electricity. (a) True (b) False
15. 15.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
19. 19.🧾 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?
20. 20.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
22. 22.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
23. 23.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
26. 26.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
31. 31.True or false: to close the fridge quickly saves electricity. (a) False (b) True
32. 32.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
38. 38.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
40. 40.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity

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