Read and Learn Some Physics Formulas And Definitions In simple way of electricity chapter
Learn Some Physics Formulas And Definitions In simple way of electricity chapter
Chapter - Electricity
Topic - 1.Ohm's Law
Electricity
Electricity is the phenomena associated with the presence and flow of electric charge.
Electric charge
Electric charge is a physical property of matter that causes it to experience a force when near other electrically charged matter.
Positively charged substances are repelled from other positively charged substances, but attracted to negatively charged substances; negatively charged substances are repelled from negative and attracted to positive
The symbol Q is often used to denote a charge.
Electric current
An electric current is a flow of electric charge through an electrical conductor.
Electric charge flows when there is voltage present across a conductor.
The SI unit for measuring an electric current is the ampere, which is the flow of electric charges through a surface at the rate of one coulomb per second.
Ohms law
I= V / R
where,
I is the current through the conductor in units of amperes
V is the potential difference measured across the conductor in units of volts
R is the resistance of the conductor in units of ohms.
Direct current (DC)
Direct current (DC) is the unidirectional flow of electric charge.
Direct current is produced by sources such as batteries, thermocouples and solar cells.
Alternating current(AC)
In AC the movement of electric charge periodically reverses direction.
In DC the flow of electric charge is only in one direction.
The usual waveform of an AC power circuit is a sine wave.
Resistive heating (Joule heating or ohmic heating)
It is the process by which the passage of an electric current through a conductor releases heat.
Here,
Q α I2 R
where
Q - heat produced
I - current
R- electrical resistance of the wire.
This relationship is known as Joule's First Law.
Electric power
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.
The electric power produced by an electric current I consisting of a charge of Q coulombs every t seconds passing through an electric potential (voltage) difference of V is
P = work done per unit time
= Q V / t
= I V
where
Q is electric charge in coulombs
t is time in seconds
I is electric current in amperes
V is electric potential or voltage in volts
In the case of resistive (Ohmic, or linear) loads, Joule's law can be combined with Ohm's law (V = I·R) to produce alternative expressions for the dissipated power:
P = I2 R
= V2 / R
where R is the electrical resistance.
Read also this article
Read also We known another way to Learn Periodic Table In Hindi
Of D - block elements
Read also We have another way to Learn Periodic table in Hindi Group wise of S- block & P - block elements :
Topic - 2.Electromagnetism
Electromagnetism
Electric current produces a magnetic field.
The magnetic field surrounding the wire persists as long as the current flows.
For a steady flow of charge through a surface, the current I (in amperes) can be calculated with the following equation:
I = Q/ t
where Q is the electric charge transferred through the surface over a time t.
More generally, electric current can be represented as the rate at which charge flows through a given surface as:
I = dQ / dt
Electromagnetic field
An electromagnetic field is a physical field produced by electrically charged objects.
It is one of the four fundamental forces of nature (the others are gravitation, the weak interaction, and the strong interaction).
The field can be viewed as the combination of an electric field and a magnetic field. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents).
Electromagnetic energy transfer is better described as being carried in the form of packets called quanta (in this case, photons) with a fixed frequency.
Planck's relation links the energy E of a photon to its frequency v through the equation:
E=h v
where h is Planck's constant (h = 6.626 × 10−34 J·s)
Read also this article
* You also Read & Learn some Physics Formulas And Definitions In Simple Way Of SI Unit & constant
* You also Learn some Physics Formulas And Definitions In Simple Way About Light Chapter
Electric field
An electric field surrounds electrically charged particles and time-varying magnetic fields.
The concept of an electric field was introduced by Michael Faraday.
Electromagnetic radiation
Electromagnetic radiation is a form of energy emitted and absorbed by charged particles which exhibits wave-like behavior as it travels through space.
It has both electric and magnetic field components, which stand in a fixed ratio of intensity to each other, and which oscillate in phase perpendicular to each other and perpendicular to the direction of energy and wave propagation.
In vacuum, electromagnetic radiation propagates at a characteristic speed, the speed of light.
Planck–Einstein equation
E = h f = h c / λ
where
h is Planck's constant
λ is the wavelength
c is the speed of light
F is the frequency
The momentum p of a photon is also proportional to its frequency and inversely proportional to its wavelength:
P = E / c = h f / c = h / λ
Photoelectric effect
It states that light could exist in discrete particle-like quantities, which later came to be known as photons.
Read this article
* You also read Short tricks For Learn Periodic Table In Easy Way period 15 to 18 with transitonal metal and also with Lanthanide & Actinide elements
* You read also Short tricks For Learn Periodic Table In Easy Way Period 1 To Period 14 by one click
Topic - 3.Electric Charges And Fields
Coulomb's Law:
Coulomb's law states that the magnitude of the Electrostatics force of interaction between two point charges is directly proportional to the scalar multiplication of the magnitudes of charges and inversely proportional to the square of the distances between them.
F=k q1 q2 / r2
where
F = force on one charge by the other
k= Coulomb constant (8.98× 109 N m2 C−2)
q1 = charge
q2= charge
r= distance
If the two charges have the same sign, the electrostatic force between them is repulsive; if they have different sign, the force between them is attractive.
Electric Field:
E = F/q
= kq / r2
where
F= field
q = charge
k= Coulomb constant (8.98× 109 N m2 C−2)
Electric field lines radiate outward from positive charges.The electric field is zero inside a conductor.
Relationship of k to ε0
Coulomb's constant is k, a proportionality factor also called the electric force constant or electrostatic constant,
k = 1 / (4 π ε0)
where
k = Coulomb constant (8.98× 109 N m2 C−2)
ε0 = permittivity of free space (8.85× 10-12)
Electric Field due to an Infinite Line of Charge:
E = 2kλ / r
where
λ = charge per unit length
r = distance
k = Coulomb constant (8.98× 109 N m2 C−2)
Electric Field due to an infinite sheet:
E=σ/ 2 ε0
where
σ = charge per unit area
ε0 = permittivity of free space (8.85× 10-12)
Electric Field inside a spherical shell
E=kqr / R3
where
r = distance from center of sphere to the charge
q = charge
R = radius of the sphere
Electric Field outside a spherical shell
E=kq / r2
where
r = distance from center of sphere to the charge
q = charge
Read also this article
* You know also Local Sbi Bank Customer Care Toll free and Contact Number & Email Id by one click:
×You know also State Bank OD India State-wise SBI Customer Care Support Numbers:
Topic - 4.Capacitance
Capacitance is the ability of a body to store an electrical charge.
Any object that can be electrically charged exhibits capacitance.
A common form of energy storage device is a parallel-plate capacitor. In a parallel plate capacitor, capacitance is directly proportional to the surface area of the conductor plates and inversely proportional to the separation distance between the plates.
Parallel-Plate Capacitor:
C= ε0 εr A / d
where
εr = the dielectric constant of the material between the plates (for a vacuum, εr = 1)
ε0 = the electric constant (8.85× 10-12)
A = area of one plate
d = separation between plates
Maximum Charge on a Capacitor:
If the charges on the plates are +q and −q, and V gives the voltage between the plates, then
Q= VC
where
Q = charge in Coulombs
V = electrical potential difference in volts
C = capacitance in farads
A 1 farad capacitor when charged with 1 coulomb of electrical charge will have a potential difference of 1 volt between its plates.
Electrical Energy Stored in a Capacitor:
For a flat-plate capacitor the energy stored is:
UE = ½ C V2
where
U = Potential Energy
Q = Coulombs
V = volts
C = capacitance in farads
Charge per unit Area:
σ = q/A
where
q = charge
A = area
Energy Density:
U =½ ε0 E2
where
u = energy per unit volume
ε0 = permittivity of free space (8.85× 10-12)
E = energy
Capacitors in Parallel:
Ceff = C1 + C2 +……
For parallel capacitors the total q is equal to the sum of the charge on each capacitor
Capacitors in Series:
1/ Ceff = 1/C1 + 1/C2 +….
Capacitors connected in series all have the same charge q.
Self-capacitance
It is the amount of electrical charge that must be added to an isolated conductor to raise its electrical potential by one unit. The reference point for this potential is a theoretical hollow conducting sphere, of infinite radius, centered on the conductor.
C= 4πε0 R
where R is the radius of the sphere
*जाने कबीर दास का जीवन परिचय
*पेट गैस से तुरंत राहत पाने के असरदार टिप्स
*कैसे जिओ सिम को चलाये 3G मोबाइल में जानने के लिए अपनाये ये सिंपल ट्रिक
*जानिये कौन सी गाड़ी किस शहर की है। एक बहुत महत्वपूर्ण मैसेज।
उत्तर प्रदेश के शहरों के व्हीकल यूनिक नंबर:-
*जाने तुरंत12th के बाद किन्हे बना सकते है आप करियर ऑपशन्स
Please do the comment on this article
For read more article
If this article is helpful
So write on comment 👉 Yes
If this article is helpless
So write on comment 👉 No
Check out Maddheshiya Ji And follow on twitter (@Maddheshiyaji):
Written by ✍🏻
Maddheshiya Ji
Comments
Post a Comment