Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 940 · 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 set the AC to 24 °C saves electricity. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) set the AC to 24 °C
3. 3.True or false: to use LED lamps wastes electricity. (a) False (b) True
4. 4.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
5. 5.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
7. 7.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) set the AC to 24 °C (d) iron one shirt at a time
9. 9.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
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 6 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
13. 13.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) use LED lamps
20. 20.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
21. 21.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to use LED lamps saves electricity. (a) True (b) False
25. 25.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
26. 26.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
27. 27.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) close the fridge quickly
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
37. 37.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
40. 40.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open

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