Currents for street cars have an electromotive force of from 550 to 660 volts.
The quantity ½Ir2w is the electromotive force due to the disk.
The electromotive force of one cell of a Daniell battery is about one volt.
The electromotive force of this cell when new is about 1.47 volts.
What may be said of the electromotive force during the second half of the revolution?
The loop has now made one quarter of a revolution and the electromotive force reached its maximum value.
Its magnetic field is obtained from permanent magnets, hence the electromotive force generated is comparatively small.
There is a limit of electromotive force below which the indicator fails to give reliable readings.
Thus the theory is only applicable when the electromotive force is not affected by variation of temperature.
Electromotive force is another name for pressure; the symbol for which is E.M.F.