Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 889 · 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 saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
2. 2.True or false: to leave the TV on standby saves electricity. (a) True (b) False
3. 3.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
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.True or false: to switch off empty rooms saves electricity. (a) False (b) True
9. 9.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
12. 12.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
22. 22.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
26. 26.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
29. 29.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 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?
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) iron one shirt at a time
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers

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