Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 936 · 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.True or false: to leave fridge door open saves electricity. (a) True (b) False
2. 2.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
3. 3.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
5. 5.True or false: to leave the TV on standby saves electricity. (a) True (b) False
6. 6.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
13. 13.🧾 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?
14. 14.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
16. 16.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
17. 17.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
20. 20.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
22. 22.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
29. 29.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
40. 40.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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