Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 309 · 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) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) use old filament bulbs
2. 2.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
6. 6.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
8. 8.🧾 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?
9. 9.True or false: to use old filament bulbs saves electricity. (a) True (b) False
10. 10.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
13. 13.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps
15. 15.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
18. 18.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
20. 20.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.True or false: to switch off empty rooms saves electricity. (a) False (b) True
23. 23.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) unplug idle chargers
24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 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?
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
30. 30.True or false: to unplug idle chargers saves electricity. (a) False (b) True
31. 31.🧾 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?
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to leave the TV on standby saves electricity. (a) False (b) True
34. 34.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
39. 39.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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