Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 164 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
2. 2.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.🧾 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
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) iron one shirt at a time
5. 5.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
7. 7.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
9. 9.True or false: to leave fridge door open wastes electricity. (a) False (b) True
10. 10.True or false: to use daylight to read saves electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
12. 12.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
13. 13.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) close the fridge quickly
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
18. 18.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
23. 23.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
25. 25.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
27. 27.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
28. 28.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🧾 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?
32. 32.True or false: to leave the TV on standby saves electricity. (a) True (b) False
33. 33.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
36. 36.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) leave the TV on standby
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 6 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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