Basics tips:
·
The
simple model of matter is made up of atoms which have positively charged nuclei
orbited by negatively charged electrons.Given sufficient energy,an electron can
be dislodged(means remove from a fixed position)from its atom.
·
Think
of electricity as the flow of energy carried by the movement of electrons
dislodged from its atom.
·
An
electrical circuit is formed when there is a closed path around which the
electron's flow.
·
In
electrical circuits, we are interested in the movement of energy from one
location to another.
·
Some
elements in a circuit supply energy. These are called sources and some elements
in a circuit expand energy. These are called Loads(or)Sinks.
·
The
total energy supplied is equal to the total energy expanded.
·
We
typically measure energy somewhat indirectly energy is measured in
Joules(J).Power is energy per unit time. Power is measured in watts(W).A watt
is equal to one joule per second.
·
1
w = 1 J/S ; Ex: A 100 w light bulb
expands 100 joules for each second.
·
The
number of electrons flowing in a circuit is called "current". It is denoted as 'I' and measured in 'Ampere's(A)'.An
Ampere is one coulomb of electrons per second.
·
1
coulomb = 6.24*10^18 electrons.
·
The
amount of energy per electron is called voltage .Voltage is denoted as 'V'.It
is measured in 'volts'.
·
1
volt = J/c (Joule/coulomb).
·
So
to determine the power we take the product of the number of electrons
flowing(i.e. current ) and the energy per electron(i.e. voltage) and we should
get a measure of power(wattage).
·
simply
the product of voltage and current is called power.
·
In
units V*A = W (or) (Joule/coulomb)*(coulomb/sec) = (Joule/sec).
EmoticonEmoticon