Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 339 · 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 close the fridge quickly saves electricity. (a) True (b) False
2. 2.🧾 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?
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
5. 5.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
9. 9.🧾 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?
10. 10.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
13. 13.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
14. 14.🧾 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
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
16. 16.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) switch off empty rooms
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) use daylight to read (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
22. 22.True or false: to use daylight to read wastes electricity. (a) True (b) False
23. 23.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
24. 24.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
25. 25.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
31. 31.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
32. 32.True or false: to use daylight to read saves electricity. (a) False (b) True
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
37. 37.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
39. 39.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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