- In today’s article, we are going to study about ‘ electricity ‘ How beneficial it is and what is the basics of the concept of electricity you should know before getting detailed information on it. And hence We will also read about some more topics like what is basic of electricity, what is current? What is the potential? What is the potential difference? What is Ohm’s law? What is resistivity? Etc gave in Detail. So, take your notebooks in your hand and get ready to study physics in an easy and sorted way.
What is the electric current?
- The total rate of flow charges in a conductor per unit time is called an electric current.
- Mathematically it can be expressed as, I= Q/ t
- The direction of electric current in a circuit is taken as opposed to the direction of flow of charges.
- The SI unit of current is Ampere. And the SI unit of electric charge is coulomb (C).
- An instrument which is used to detect current in an electric circuit is called Ammeter.
Electric potential and potential difference
The difference in electric pressure (keeps the electron in moving condition) is called potential difference. The reason behind this potential difference can be an electrical battery with two or more than two cells.
In terms of physics, electric potential can be expressed as,
Potential difference V between two points= work is done W/ charge Q
The SI unit of potential difference is volt.
One volt potential difference arises when 1-joule work is done to move a charge of 1 coulomb from one point to another point.
Hence, 1 volt= 1 joule/ 1 coulomb
1V= 1 j C^-1
- The device which is used to measure the potential difference is called voltmeter.
- The arrangement of the voltmeter is always parallel in a circuit, where the potential difference has to be measured.
Ohm’s law states that voltage in the circuit is directly proportional to the current flowing throughout the circuit.
Where R is constant. And for a given metallic wire( conductor) at a given temprature, R constant is termed as resistance. Its unit is ohm.
From the above equation, we can say that,
R= V/ I
To derive the SI unit of R let’s write down the SI unit of V and I,
R= volt/ ampere = ohm
And notation of ohm is as follows Ω.
The electrical resistance of the conductor depends (i) on its length, (ii) on its area of
cross-section, and (iii) on the nature of the material.
R ∝ l
and R ∝ 1/A
R ∝ l
or, R = ρl/A
Where ρ is called resistivity.
So our article is finished and after completely reading this article, one can easily tell what is electricity. And we have also discussed some more topics like what is basic of electricity, what is current? Define potential? And how will you define the potential difference? Define ohm’s law? And also define resistivity? Etc
So one can say that they got detailed information about Electricity and basic information about other topics.
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