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A voltaic cell is made of copper and aluminum electrodes What is the emf of this cell?
The EMF of a copper-aluminum voltaic cell can be determined by the standard reduction potential of each metal. Copper has a higher standard reduction potential than aluminum, so the cell will have a positive EMF. The exact value can be determined by calculating the difference between the reduction potentials of copper and aluminum.
Is free energy of cell reaction positive when emf of cell reaction is positive?
No, the free energy of a cell reaction is negative when the emf of the cell reaction is positive. This is because a positive emf indicates that the reaction is spontaneous and capable of performing work, resulting in a negative change in free energy.
What are electrochemical series and its importance?
THE ELECTROCHEMICAL SERIES TELLS US WHICH METALS ARE MORE ACTIVE CHEMICALLY THAN OTHERS AND WHICH WILL REPLACE OTHERS FROM A SOLUTION, SUCH AS IS USED IN PLATING METALS. THE BIGGEST USE IS IN CREATING BATTERIES (ELECTROCHEMICAL MATERIALS) WHICH OPERATE BECAUSE OF THE DIFFERENCES IN CHEMICAL ACTIVITY BETWEEN TWO METALS. ZINC AND COPPER DIFFER GREATLY IN THEIR CHEMICAL ACTIVITY AND WHEN PLACED IN A SUITABLE ENVIRONMENT( FOR EXAMPLE, PLACED IN AN ACID SOLUTION (LEMON) AND CONNECTED WITH A WIRE OR METER, WILL PRODUCE ELECTRICITY WHICH IS A FLOW OF ELECTRONS. THE ELECTROCHEMICAL SERIES TELLS US WHICH METAL WILL MOST READILY LOSE ELECTRONS TO ANOTHER SUBSTANCE, THEREBY PRODUCING THE HIGHER VOLTAGE OR FLOW OF ELECTRONS.
In a thermocouple the temperature of the cold junction is 20oC the temperature of inversion is 520oC What is The neutral temperature?
the neytral temp will be 520 degree cel,as it is the temp pointing the EMF limit ,it doesn't have nything to do with span or the temp diff.
Explain the theory behind the potentiometric titration of acid base?
In potentiometric titration, the change in the concentration of H+ ions are monitored based on the emf measurement with respect to Saturated calomel electrode ( a reference electrode having a standard reduction potential of 0.2422 V). H+ ions concentration in terms of pH change is measured using primarily by quinhydrone electrode. Based on hydrogen electrode also it can be measured. An electrochemical cell consists of H+ ions (acid to be titrated) in contact with hydrogen gas (1 atm) or quinhydrone/ quinone should be formed and the emf (potential difference) of the cell is measured with reference to saturated calomel electrode (SCE). Then based on Nernst equation value of standard electrode potential of hydrogen ion is, EH = Eo + 0.0591 log [H+] or EH = - 0.0591 pH since Eo = 0 V and -log [H+] = pH So EMF of the cell is Ecell = ESCE - EH Ecell = 0.2422 - EH The Ecell value is plotted ( Y axis) against volume of base added (X axis). The volume corresponds to drastic Ecell change gives equivalence point of the titration. At equivalence point all the free H+ ions are replaced as H2O and this is reflected and can be inferred in the Ecell values.
How does the EMF of a battery which is made up of cells in series compare with the EMF of the individual cell?
The EMF of a battery made up of cells in series is equal to the sum of the EMFs of the individual cells. When cells are connected in series, their voltages add up. For example, if you have two 1.5V cells in series, the total EMF of the battery would be 3V.
What are the differences between potential difference and emf?
Potential difference is the difference in electric potential energy between two points in a circuit, while electromotive force (emf) is the total energy provided per unit charge by a battery or voltage source. In other words, potential difference measures the voltage drop across a component in a circuit, while emf represents the energy per unit charge supplied by the source.
How do you calculate total emf in series connecte cells?
With cells connected in series, the total emf of the 'stack' is simply the sum of the individual emf's of the individual cells. -- Even if one cell is connected backwards in the string. Then its emf is considered negative when the sum is being performed. -- All of this is true only as long as there is no external connection between the ends of the stack, you're measuring the emf on an 'open-circuit' basis with a voltmeter, and the cells are not providing any current to an external circuit. Once the series combination of cells is connected to an external circuit and begins to produce current, the total emf at the terminals of the stack will decrease. It'll depend on the magnitude of the current, and on the 'internal impedance' of each cell. If the cells are not precisely identical and in identical states of charge, then a calculation of the total emf is virtually impossible.
What are the differences between EMF and EMP, and how do they affect electronic devices?
EMF (electromagnetic field) is a continuous field of electromagnetic radiation, while EMP (electromagnetic pulse) is a sudden burst of electromagnetic energy. EMF can interfere with electronic devices over time, while EMP can cause immediate and severe damage to electronic devices by overwhelming their circuits.
In colomn answer of difference between statically indused emf and dynamicaly indused emf?
Statically induced emf is produced by the relative motion between a conductor and a magnetic field, while dynamically induced emf is generated due to a change in the magnetic field strength experienced by a conductor. Statically induced emf does not require any physical movement of the conductor, while dynamically induced emf is produced when the magnetic field changes over time.
How the cells of same emf can be connected to get large value of emf?
They are connected in 'series', the negative terminal of one cell connected to the positive terminal of the next cell, and so on with as many cells as you have, so that there is only one path for current through the entire combination of cells. In this configuration, the EMF of the combination is the sum of the individual EMFs, but the combination can't deliver any more current (amperes) than any single cell can.
How many ways are there to generate an emf?
Electromotive force (emf) can be generated in several ways, primarily through electromagnetic induction, chemical reactions in batteries, and thermoelectric effects. In electromagnetic induction, emf is generated by changing magnetic fields or relative motion between a conductor and a magnetic field. Batteries produce emf through electrochemical reactions, while thermoelectric generators convert temperature differences directly into electrical energy. Each method utilizes different principles of physics and chemistry to generate electrical energy.
What is the difference between emf and mmf?
emf is electromotive force mmf is magnetic motive force emf drives electon where as mmf drives magnetic field
It can be said that pressure and electromative force are the same?
There is analogy between pressure and EMF or voltage. What pressure is to the liquids, EMF or voltage is to electric current. But, of course, they are not the same.
What is the difference between a DC motor and a generator in terms of EMF?
During the operation of a DC motor, EMF is created across its terminals using an external source. Whereas, in a DC generator EMF is created across its terminal based on principle of dynamically induced EMF. So talking in terms of EMF, in DC motor EMF is consumed by the motor coil and utilized to rotate the axle. On the other hand, in DC generator EMF developed across coil is transfered to a load or a battery and consumed by them.
Is emf a scalar or vector quantity?
Emf has direction within a current loop, though it is not scalar. It's a bit between though as direction should be otherwise accounted for when discussing induced Emf. Not quite either.
How are emf measured?
emf in volts
