RESISTANCE,CIRCUIT,FREQUENCY,AC CURRENT,DC CURRENT,RECTIFIER,POWER,VOLTAGE,TRANSFORMER,SHORT CIRCUIT,CONDUCTOR,INSULATOR,

1. RESISTANCE :-
• Resistance is a measure of the opposition
to the current flow in an electric circuit.
• Resistance is measured in Ohms,
symbolized by the Greek letter Omega
[ohms].
• Ohms are named after George simon
ohms [1784-1854].
FACTOR WHICH IS RESPONSIBLE FOR
RESISTANCE :-
1. Length of conductor
2. Area of cross section
3. Material of conductor.
CIRCUIT :-
• A Circuit is a complete circular path that
electricity flows through.
• The term circuit can be used in a general
sense to refer to any fixed path that

2. electricity data or a signal can travel
through.
FREQUENCY :-
• Frequency is the rate at which current
changes direction per second.
• It is measured in hertz [Hz], on in
international unit of measure where 1
hertz is equal to 1 cycle per second.
1 hertz = 1 cycle/sec.
AC CURRENT :-
• The electric charge [current] change the
direction periodically, bidirectional flow of
charge.
• It is used to deliever power to house,
office, building…etc

3. DIRECT CURRENT :-
• The electric charge [current ] only flows in
one direction , unidirectional flow of
charge.
• Direct current provides a constant voltage.
It is easier to understand than A.C current.
SOURCE OF DC CURRENT :-

4. • A cell
• A Battery
• DC Dynamo
RECTIFIER:-
• It is a device used to convert AC Current to
DC Current.
• Battery produces direct current.

5. POWER :-
• In A.C Circuit, the power is defined as the
rate at which work is being in the circuit.
VOLTAGE:-
• Voltage the “pressure” that pushes
electricity.
• The amount of voltage is indicated by a
unit known as volt.
• And higher voltages cause more electricity
to flow to an electronic device.
TRANSFORMER:-

6. • A Transformer is a device used in the
power transmission of electric energy.
• It is commonly used to increase or
decrease the supply voltage without a
change in the frequency of AC between
circuits.
SHORT CIRCUIT :-
• A Short circuit is an abnormal connection
between two nodes of an electric circuit
intended to be at different voltages.
• Short circuit level is the amount of
current that flows on the system
during a fault .
CONDUCTOR:-
• A Conductor is a substance or material
that allows electricity to flow through it .
• In a conductor ,electrical charge carriers
,usually electrons or ions ,move easily
from atom to atom when voltage is
applied .

7. INSULATOR :-
• An insulator is a substance or material
that do not allow electricity to pass
through them .
• Insulators oppose electric current and so
they are used as a protection from the
dangerous effects of electricity.
CURRENT :-
• It is a flow of electrical charge carriers
,usually electrons or electron deficient
atoms.
• The common symbols for current is “I”.
• The S.I Unit is ampere “A”.
PROTONS :-
• The proton is a subatomic particle with a
positive electric charge.
NEUTRONS :-

8. • Neutrons are subatomic particle found
inside the nucleus of every atom .
• The only exception is hydrogen .
CAPACITOR:-
• A Capacitor is a two terminal electrical
device that can store energy in the form
of an electric .
• The most common use of capacitor is –
1. Energy storage
2. Power conditioning
3. Electronic noise filtering
4. Remote sensing
5. Signal coupling /decoupling.