Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 316 · 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 wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
3. 3.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.True or false: to use daylight to read wastes electricity. (a) True (b) False
7. 7.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
9. 9.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
14. 14.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
15. 15.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.True or false: to use LED lamps saves electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
19. 19.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
23. 23.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
27. 27.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.🧾 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?
29. 29.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 60 W filament bulb is swapped for a 9 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 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
40. 40.🧾 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?

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