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What is an electrochemical cell? Give its construction and working. |
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Answer» An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions. Electrochemical cells are constructed of various materials, such as the wire, the solutions themselves, and the containers. All of these materials cause the cell to have a property calledinternal resistance. As the current flows in the cell over time, this resistance causes the cell to lose some of its potential, orvoltage. What remains of the cell's voltage after subtracting the voltage lost due to internal resistance is called theterminal potential difference. This is expressed as: In this equation, Vt.p.d.is the terminal potential difference,emfis the electromotive force, or ideal amount of energy (in volts) provided by the cell before there is resistance,Iis the current in amperes, andris the internal resistance in ohms. |
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