- In today’s article, we are going to study about ‘ electricity ‘ How beneficial it is and what is the basics of concept of electricity you should know before getting a 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 potential? What is potential difference? What is ohm’s law? What is resistivity? Etc given in Detail. So, take your notebooks in you hand and get ready to study physics in an easy and sorted way.
What is electric current?
- The total rate of flow charges in a conductor per unit time is called electric current.
- Mathematically it can be expressed as,I= Q/ t
- The direction of electric current in a circuit is taken as opposite 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 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 a 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 done W/ charge Q
The SI unit of potential difference is volt.
One volt potential difference arise 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 voltmeter is always parallel in circuit, where the potential difference has to be measured.
Ohm’s law states that voltage in circuit is directly proportional to the current flowing through out 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 above equation we can say that,
R= V/ I
To derive the SI unit of R let’s write down SI unit of V and I,
R= volt/ ampere = ohm
And notation of ohm is as follows Ω.
Electrical resistance of the conductor depends (i) on its length, (ii) on its area of
cross-section, and (iii) on the nature of 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 what is basic of electricity, what is current? Define potential? And how will you define potential difference? Define ohm’s law? And also define resistivity? Etc
So one can say that they got a detailed information about Electricity and basic information about other topics.
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