Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 500 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
3. 3.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
4. 4.🧾 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?
5. 5.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
8. 8.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
11. 11.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
13. 13.🔍 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) close the fridge quickly
14. 14.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
17. 17.True or false: to switch off empty rooms saves electricity. (a) False (b) True
18. 18.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
19. 19.True or false: to close the fridge quickly saves electricity. (a) False (b) True
20. 20.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
23. 23.🧾 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?
24. 24.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to use daylight to read saves electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
33. 33.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) set the AC to 24 °C (d) use LED lamps

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