Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 800 · 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) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
3. 3.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
6. 6.🧾 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?
7. 7.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
9. 9.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) use daylight to read
13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
14. 14.True or false: to close the fridge quickly saves electricity. (a) True (b) False
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use daylight to read (d) use LED lamps
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
21. 21.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
23. 23.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
24. 24.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
30. 30.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
31. 31.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
32. 32.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
35. 35.🧾 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?
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open

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