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What are the differences between galvanic series and emf series?
Wiki User
∙ 12y ago
1)galvanic series is for both elements and alloys whereas emf series is only for elements
2)galvanic series tells about relative tendencies of corrosion whereas emf series tells about relative tendencies of displacement
Wiki User
∙ 12y ago
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Is free energy of cell reaction positive when emf of cell reaction is positive?
G = -nFE Therefore, G will be negative when EMF is positive.
A voltaic cell is made of copper and aluminum electrodes What is the emf of this cell?
1.56 v
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.
Can you use copper vessels to store AgNO3 solution?
no because emf of cu ic less as compared to Agno3 as we keep agno3 in cu reaction will occour
Why ac current is used in conductometric titration?
Because if DC is used, solution undergoes electrolysis and the products of electrolysis set up a back emf which opposes the flow of current -s
What are the differences between potential difference and emf?
emf is present mainly in battery and potential difference is mainly present in circuit. emf is greater than p.d and p.d is greater than emf.......the units of both are Volt.....
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.
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.
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
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.
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.
How are emf measured?
emf in volts
Why emf of battery driving potentiometer is greater than emf of the cell to be measured?
Bcoz the emf which is to be measured is less than emf of driving cell....
What is the difference between CEMF and EMF?
Only the relative direction they are moving. EMF, measured in Volts, travels along a conductor, perhaps because a magnetic field has built up around the conductor. When that magnetic field collapses, CEMF, or counter-EMF is generated in the conductor, and it travels in the opposite direction of the original EMF, countering the original flow of electricity. EMF is Electromotive Force, and is one component of measuring electricity. EMF is measured in Volts, and represents the 'pressure' moving the electricity along.
Does motional emf call induced emf?
yes indused emf is also called motional emf. If an open coil is subjected to a variable magnetic field, at the ends of the coil a potential difference is induced which is called induced emf. If a coil is connected to an emf source and switched on, the rising current will produced an variable magnetic field which in turn produces an emf. It is called back emf.
What is the difference between the emf of a battery and the lost volts when discharging called?
Internal resistance
What is the difference between Counter-electromotive force and back emf?
They are Same for dc motor
