Wave and electricity notes

Wavelength
The wavlen*th is defined as the distance between two sucessive particles which are
at exactly the smae point in their paths and are moving in the same direction.
Wavefront
Any line or section taken through an advancing wave in which all the - particles
are in the same pahse is called the wavefront.
Frequency
The number oft complete oscillations per .second is called the frequency.
Neutral point
A neutralp point id defined at which the resultant magnetic flux density is zero.
Ampere
The ampere is the current which if flowing in two straight prallel wires of infinite
length placed 1 metre apart in a vacuum will produce on each of tic wires a force kof
2 X 10 -7 newton per metre length.
Coulomb
A coulomb is the quantity of electricity which passes any point in a circuit in 1 secon
when a steady current of 1 ampere is flowing.
The volt
Two points are at a potential difference of 1 vlo volt if 1 joule of work is done per
coulomb of electricity passing from one point to another.
Emf.
The emf of a cell in volts is therfore :defined as the total work done in joules
per coulomb of electricity convey int the citcuit in which the cell is connected.
Ohms 39aw
The current passing through a wite at constant temperature is proportional to the potential
differnece between its ends.
Resistance
TIT resistance of a conductor is the ratio of. potential difference across it to the
current flowing through it.
Ohm
The ohm is the resistance of a conductor such that when a potential difference of 1
volt is applied to its ends a current of 1 ampere flows through it.
Right hand grip rule
Imagine the wire to be grasped in the right hand with the thumb pointing along the wire
in the direction of the current. The direction of the fingers will give the direction
of the magnetic flux.
Flemmings left hand rule
place the forefinger , seconft finger and thumb of the left hand mutually at right angles
Then if the Forefinger points in the direction of the field and the seCond finger in
the direction of the Current then the thumb will point in the direction of the