Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 583 · 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.True or false: to use LED lamps wastes electricity. (a) True (b) False
2. 2.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
4. 4.True or false: to unplug idle chargers saves electricity. (a) False (b) True
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
7. 7.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) use LED lamps
12. 12.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
14. 14.True or false: to use LED lamps saves electricity. (a) True (b) False
15. 15.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
17. 17.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
19. 19.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
20. 20.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
24. 24.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
30. 30.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
34. 34.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 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?
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
38. 38.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby

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