Table of Contents
- 1 Does emf of cell depend on temperature?
- 2 Does emf of cell depend on concentration?
- 3 Which factors does not affect the emf of a cell?
- 4 Why does cell potential increase with temperature?
- 5 How does concentration affect emf?
- 6 What is emf of cell?
- 7 Does resistance affect EMF?
- 8 Does emf of battery increases with temperature?
Does emf of cell depend on temperature?
The Emf of a cell is measured at several temperatures. The emf produced by an electrochemical reaction will generally change with temperature. The free energy change can be found directly from the measured emf, while the entropy change can be found from the slope of the plot of the emf vs. the temperature.
Does emf of cell depend on concentration?
Concept: The emf of a cell depends on the concentrations of ion and on gas pressures. Nernst equation relates the cell emf’s for various concentrations and gas pressures to standard electrode potentials.
Which factors does not affect the emf of a cell?
SHAPE OF ELECTRODE,DISTANCE BETWEEN ELECTRODES,THE AMOUNT OF ELECTROLYTE….
What are the factors on which resistance of cell depends?
Thus, the internal resistance of a cell depends on the factors like distance between the electrodes, the temperature, the effective area of the electrodes and the concentration of the solution.
How does the emf change with temperature?
As temperature rises the resistance of this wire will increase. Therefore, according to the ohm’s law, the resistance is directly proportional to the emf in volts. therefore, increasing the temperature increase the resistance, their by increasing emf. Thus temperature affects the emf of in a direct way.
Why does cell potential increase with temperature?
However, in operating fuel cells, in general a higher cell temperature results in a higher cell potential. This is because the voltage losses in operating fuel cells decrease with temperature, and this more than compensates for the loss of theoretical cell potential.
How does concentration affect emf?
If the concentrations of reactants increase relative to the products, the cell reaction becomes more spontaneous and the emf increases. Conversely, if the concentrations of products increase relative to reactants, the emf decreases.
What is emf of cell?
The emf of a cell is the sum of the electric potential differences (PDs) produced by a separation of charges (electrons or ions) that can occur at each phase boundary (or interface) in the cell. The magnitude of each PD depends on the chemical nature of the two contacting phases.
Does size affect EMF?
The e.m.f depends on the nature of these three. Changes in temperature will also affect the e.m.f output of a battery because it will alter the value of internal resistance as well as promote more chemical reactions and disintegration of the electrolyte. But the size of the cell does not matter.
What is an EMF of a cell?
Does resistance affect EMF?
From the formula, it is evident that the induced EMF does not depend on the resistance of the coil or wire. However, if the induced EMF produces a current, then that produced current will depend on the resistance of the coil or wire.
Does emf of battery increases with temperature?
However, it does not affect the amount of current that is flowing in the circuit. – EMF is produced by the movement of ions in the solution to the respective electrodes. – When we increase the temperature, the ions gain more energy and hence the resistance offered against their movement is reduced.