temperature,length of the wire,area,potential difference
The emf equation of signal phase transform
Because emf is the very source of voltage, either chemical or inductive, an can be meassured at open circuit only so, internal resistance of the supplier is not affecting it.
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.
Identify factors which affect the power of electromagnet?
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.
E. Joined in parallel, the voltage (or electromotive force, "emf") isn't additive. You'd get four times the current, or four times the life of a single battery, but it would have the same voltage.
In simple, number of turns of armature, intensity of magnet and speed of machine are major factor affecting induced emf in dc generator. If speed is increased, voltage will be increased simultaneously. Also Voltage is greater if number of turns are increased. Electro-magnet in the poles of a DC Generator also play an important role in the induced EMF. If intensity of magnet is exceeds, voltage also increased as well.
emf in volts
Voltage. Or, if you prefer, electromotive force (emf). What creates voltage? Electromagnetic action. Electrochemical action. Piezoelectric effect. Photoelectric effect. Thermoelectric effect. Contact electrification (static electricity). What was left out? BREAKDOWN produce in a crystal
Bcoz the emf which is to be measured is less than emf of driving cell....
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.
number of conductors speed magnitude of the magnetic flux