Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 283 · 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 use daylight to read saves electricity. (a) True (b) False
2. 2.True or false: to leave fridge door open wastes electricity. (a) True (b) False
3. 3.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
8. 8.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
11. 11.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
14. 14.🧾 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?
15. 15.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
16. 16.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
17. 17.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
22. 22.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.True or false: to use LED lamps saves electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) close the fridge quickly (d) set the AC to 24 °C
32. 32.🧾 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?
33. 33.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
35. 35.True or false: to use daylight to read wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
39. 39.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time

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