Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 152 · 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 old filament bulbs (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
3. 3.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
7. 7.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) use daylight to read
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
11. 11.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
12. 12.True or false: to use LED lamps saves electricity. (a) False (b) True
13. 13.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
16. 16.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
17. 17.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.True or false: to leave fridge door open saves electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
21. 21.🧾 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?
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
24. 24.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
25. 25.🧾 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?
26. 26.🧾 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?
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
32. 32.True or false: to leave fridge door open wastes electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
36. 36.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
37. 37.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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