Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 557 · 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.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
3. 3.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
6. 6.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
7. 7.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
13. 13.True or false: to leave fridge door open wastes electricity. (a) True (b) False
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
15. 15.True or false: to close the fridge quickly saves electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) use LED lamps (d) switch off empty rooms
17. 17.🧾 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?
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
19. 19.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
20. 20.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to switch off empty rooms saves electricity. (a) False (b) True
24. 24.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
28. 28.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
31. 31.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
32. 32.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
35. 35.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) use old filament bulbs (d) close the fridge quickly
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
38. 38.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
39. 39.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity

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