Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 159 · 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.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
2. 2.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
4. 4.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
5. 5.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
7. 7.True or false: to use daylight to read wastes electricity. (a) True (b) False
8. 8.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
9. 9.True or false: to leave the TV on standby saves electricity. (a) True (b) False
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
11. 11.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
12. 12.True or false: to switch off empty rooms saves electricity. (a) True (b) False
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
17. 17.🧾 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?
18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) set the AC to 24 °C
19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
25. 25.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.Which of these saves electricity? (a) use daylight to read (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
30. 30.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use old filament bulbs (d) close the fridge quickly
32. 32.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
39. 39.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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