Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 773 · 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 is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves 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 3 hours. How many watt-hours (Wh) are saved?
9. 9.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
10. 10.True or false: to use daylight to read saves electricity. (a) True (b) False
11. 11.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
13. 13.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
17. 17.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
20. 20.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
22. 22.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
24. 24.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
28. 28.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
33. 33.🧾 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?
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 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?
37. 37.True or false: to use LED lamps wastes electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
39. 39.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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