Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 593 · 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 family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
3. 3.🧾 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?
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
8. 8.🧾 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?
9. 9.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
10. 10.True or false: to leave the TV on standby saves electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) close the fridge quickly
14. 14.True or false: to leave fridge door open saves electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
21. 21.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
26. 26.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
32. 32.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
37. 37.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
39. 39.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.True or false: to use daylight to read wastes electricity. (a) True (b) False

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