Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 278 · 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) use daylight to read (c) unplug idle chargers (d) use LED lamps
2. 2.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
4. 4.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
8. 8.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
14. 14.🧾 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?
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
16. 16.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
17. 17.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
20. 20.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
23. 23.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
25. 25.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
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 4 hours. How many watt-hours (Wh) are saved?
27. 27.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
28. 28.True or false: to use daylight to read saves electricity. (a) False (b) True
29. 29.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
31. 31.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
33. 33.True or false: to leave fridge door open wastes electricity. (a) False (b) True
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) leave the TV on standby
37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
38. 38.🧾 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?
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
40. 40.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

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