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Which of the following cells has the highest energy density?- a)Lead-acid accumulator
- b)Nickel-Iron (NiFe) cell
- c)Lithium-Iron cell
- d)Mercury-Cadmium cell
Correct answer is option 'C'. Can you explain this answer?
Which of the following cells has the highest energy density?
a)
Lead-acid accumulator
b)
Nickel-Iron (NiFe) cell
c)
Lithium-Iron cell
d)
Mercury-Cadmium cell
|
Rukayat Bello answered |
Understanding Energy Density
Energy density is a crucial factor when comparing batteries, as it indicates how much energy a cell can store relative to its weight or volume. Higher energy density means more energy stored in a smaller or lighter package, which is essential for many applications like electric vehicles and portable electronics.
Comparison of Battery Types
Here’s a brief overview of the cells mentioned:
Conclusion: Why Lithium-Iron Stands Out
Lithium-Iron cells (or lithium-ion cells) have the highest energy density among the options listed. This makes them ideal for applications requiring lightweight and compact energy sources. Their ability to store more energy in less space and their rapid charging capabilities contribute to their dominance in modern technology.
In summary, when it comes to energy density, lithium-iron cells lead the pack, making them the preferred choice for advanced energy storage solutions.
Energy density is a crucial factor when comparing batteries, as it indicates how much energy a cell can store relative to its weight or volume. Higher energy density means more energy stored in a smaller or lighter package, which is essential for many applications like electric vehicles and portable electronics.
Comparison of Battery Types
Here’s a brief overview of the cells mentioned:
- Lead-Acid Accumulator: Energy density around 30-50 Wh/kg. Traditionally used in vehicles, they are heavy and bulky.
- Nickel-Iron (NiFe) Cell: Energy density approximately 50-100 Wh/kg. Known for durability but has lower energy density compared to lithium.
- Lithium-Iron Cell: Energy density ranges from 150-250 Wh/kg. This cell type, often referring to lithium-ion technology, excels in energy storage and efficiency.
- Mercury-Cadmium Cell: Energy density is around 50-80 Wh/kg. While they have some advantages, they are less common due to environmental concerns.
Conclusion: Why Lithium-Iron Stands Out
Lithium-Iron cells (or lithium-ion cells) have the highest energy density among the options listed. This makes them ideal for applications requiring lightweight and compact energy sources. Their ability to store more energy in less space and their rapid charging capabilities contribute to their dominance in modern technology.
In summary, when it comes to energy density, lithium-iron cells lead the pack, making them the preferred choice for advanced energy storage solutions.
Which of the following defects occurs when the electrodes of a simple voltaic cell are made of the same metal?- a)Internal resistance
- b)Electrode polarization
- c)Leakage of electrolyte
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Which of the following defects occurs when the electrodes of a simple voltaic cell are made of the same metal?
a)
Internal resistance
b)
Electrode polarization
c)
Leakage of electrolyte
d)
None of the above
|
Deepak Iyer answered |
When the electrodes of a voltaic cell are made of the same metal, electrode polarization occurs, leading to a decrease in cell efficiency.
Which of the following statements is true about a simple voltaic cell?- a)It converts electrical energy into chemical energy.
- b)It converts chemical energy into electrical energy.
- c)It uses a single electrode and an electrolyte.
- d)It operates without any defects.
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is true about a simple voltaic cell?
a)
It converts electrical energy into chemical energy.
b)
It converts chemical energy into electrical energy.
c)
It uses a single electrode and an electrolyte.
d)
It operates without any defects.
|
|
Deepak Iyer answered |
A simple voltaic cell converts chemical energy into electrical energy through a redox reaction.
Which of the following cells is commonly used as a backup power supply in telecommunication systems?- a)Lead-acid accumulator
- b)Nickel-Iron (NiFe) cell
- c)Lithium-Iron cell
- d)Mercury-Cadmium cell
Correct answer is option 'A'. Can you explain this answer?
Which of the following cells is commonly used as a backup power supply in telecommunication systems?
a)
Lead-acid accumulator
b)
Nickel-Iron (NiFe) cell
c)
Lithium-Iron cell
d)
Mercury-Cadmium cell
|
|
Deepak Iyer answered |
Lead-acid accumulators, also known as lead-acid batteries, are commonly used as backup power supplies in telecommunication systems.
Which of the following cells is commonly used in flashlights?- a)Daniel cell
- b)Leclanché cell
- c)Dry Leclanché cell
- d)Wet Leclanché cell
Correct answer is option 'C'. Can you explain this answer?
Which of the following cells is commonly used in flashlights?
a)
Daniel cell
b)
Leclanché cell
c)
Dry Leclanché cell
d)
Wet Leclanché cell
|
|
Deepak Iyer answered |
Dry Leclanché cells, also known as dry cells, are commonly used in flashlights and other portable devices.
What is the electrolyte used in a Daniel cell?- a)Zinc sulfate and copper sulfate
- b)Potassium hydroxide
- c)Ammonium chloride
- d)Zinc chloride and manganese dioxide
Correct answer is option 'A'. Can you explain this answer?
What is the electrolyte used in a Daniel cell?
a)
Zinc sulfate and copper sulfate
b)
Potassium hydroxide
c)
Ammonium chloride
d)
Zinc chloride and manganese dioxide
|
|
Deepak Iyer answered |
The electrolyte used in a Daniel cell is a mixture of zinc sulfate and copper sulfate.
How can the defect of electrode polarization be corrected in a voltaic cell?- a)By adding a salt bridge
- b)By using different metals as electrodes
- c)By increasing the concentration of the electrolyte
- d)By reducing the size of the electrodes
Correct answer is option 'C'. Can you explain this answer?
How can the defect of electrode polarization be corrected in a voltaic cell?
a)
By adding a salt bridge
b)
By using different metals as electrodes
c)
By increasing the concentration of the electrolyte
d)
By reducing the size of the electrodes
|
|
Deepak Iyer answered |
Increasing the concentration of the electrolyte can help correct the defect of electrode polarization in a voltaic cell.
What is the function of a salt bridge in a voltaic cell?- a)To prevent the flow of electrons.
- b)To complete the circuit.
- c)To regulate the flow of current.
- d)To provide a medium for ion migration.
Correct answer is option 'D'. Can you explain this answer?
What is the function of a salt bridge in a voltaic cell?
a)
To prevent the flow of electrons.
b)
To complete the circuit.
c)
To regulate the flow of current.
d)
To provide a medium for ion migration.
|
|
Deepak Iyer answered |
A salt bridge in a voltaic cell allows the migration of ions, maintaining charge balance and completing the circuit.
Which of the following cells is not a primary cell?- a)Daniel cell
- b)Leclanché cell
- c)Dry Leclanché cell
- d)Wet Leclanché cell
Correct answer is option 'A'. Can you explain this answer?
Which of the following cells is not a primary cell?
a)
Daniel cell
b)
Leclanché cell
c)
Dry Leclanché cell
d)
Wet Leclanché cell
|
|
Deepak Iyer answered |
The Daniel cell is a primary cell, whereas the other options are types of Leclanché cells, which are primary or secondary cells.
What is the active ingredient in the positive electrode of a Leclanché cell?- a)Zinc
- b)Carbon
- c)Manganese dioxide
- d)Ammonium chloride
Correct answer is option 'C'. Can you explain this answer?
What is the active ingredient in the positive electrode of a Leclanché cell?
a)
Zinc
b)
Carbon
c)
Manganese dioxide
d)
Ammonium chloride
|
|
Deepak Iyer answered |
Manganese dioxide is the active ingredient in the positive electrode (cathode) of a Leclanché cell.
Chapter doubts & questions for Electric Cells - Physics for JAMB 2025 is part of JAMB exam preparation. The chapters have been prepared according to the JAMB exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for JAMB 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Physics for JAMB
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