Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 39 · 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.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
2. 2.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
6. 6.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) unplug idle chargers
8. 8.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🧾 A 50 W appliance runs for 2 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 8 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
16. 16.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
19. 19.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to use LED lamps saves electricity. (a) True (b) False
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
24. 24.True or false: to close the fridge quickly saves electricity. (a) True (b) False
25. 25.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) unplug idle chargers (d) use LED lamps
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
33. 33.True or false: to leave the TV on standby saves electricity. (a) False (b) True
34. 34.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
35. 35.🧾 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?
36. 36.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
37. 37.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 4 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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