Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 524 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.True or false: to close the fridge quickly saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
4. 4.🧾 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
5. 5.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
6. 6.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
11. 11.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
14. 14.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) iron one shirt at a time
16. 16.🧾 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?
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
18. 18.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
19. 19.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
22. 22.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) switch off empty rooms
24. 24.True or false: to use LED lamps wastes electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
26. 26.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
27. 27.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) unplug idle chargers
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) unplug idle chargers
33. 33.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
36. 36.True or false: to leave fridge door open saves electricity. (a) True (b) False
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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