Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 17 · 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 saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
2. 2.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
6. 6.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
9. 9.True or false: to leave fridge door open saves electricity. (a) False (b) True
10. 10.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
11. 11.🧾 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?
12. 12.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
13. 13.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
15. 15.True or false: to leave the TV on standby saves electricity. (a) False (b) True
16. 16.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
18. 18.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
21. 21.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
24. 24.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
26. 26.🧾 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?
27. 27.True or false: to use old filament bulbs saves electricity. (a) False (b) True
28. 28.True or false: to use daylight to read saves electricity. (a) True (b) False
29. 29.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
36. 36.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
38. 38.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity

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