Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 346 · 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) wastes electricity (b) saves electricity
2. 2.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to use daylight to read saves electricity. (a) False (b) True
4. 4.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) run fans in empty rooms
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
10. 10.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
19. 19.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) iron one shirt at a time
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
22. 22.🧾 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?
23. 23.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
28. 28.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
29. 29.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
32. 32.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
33. 33.🔍 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
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
37. 37.🧾 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?
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
39. 39.True or false: to leave the TV on standby saves electricity. (a) True (b) False
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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