Question

what is current density? obtain ohms law in vector form​

Answer 1

Answer:

where V is the voltage drop across a resistor of resistance R when a current I flows through it. Let us generalize this law so that it is expressed in terms of E and J, rather than V and I. Consider a length l of a conductor of uniform cross-sectional area A with a current I flowing down it.

Answer 2

Explanation:

Current Definition:

We can define current as the flow of electrically charged particles, mostly in those atoms which are electron-deficient. The standard symbol of current is capital I. The standard unit of current is ampere and it is denoted by A. Conversely, a current of one ampere is one coulomb of charge(6.24 x 1018 charge carriers) going past a given point per second. According to Physicists, Current is considered to move from relatively positive to negative points, and this is known as conventional current. Electrons are known to be the common negatively-charged carriers and circulate from relatively negative to positive points. In this article, we will learn about the concepts of Current Density in a detailed manner.

Types of Current

The current can be divided into two types.

Direct Current:

Direct current travels towards the same direction at all points, although the instantaneous magnitude can differ.

An example of DC is the current generated by an electrochemical cell.

Alternating Current:

The flow of charge carriers is towards the opposite direction periodically in an alternating current.

The number of AC cycles per second is known as frequency and calculated in Hertz.

चालक माध्यम के भीतर किसी प्रष्ठ के लम्बवत दिशा मे इकाई क्षेत्रफल के द्वारा प्रवाहित होने वाली विद्युत धारा, धारा घनत्व कहलाती है। यह एक सदिश राशि है, जबकि धारा स्वयं एक अदिश राशि होती है। धारा घनत्व को J से प्रदर्शित करते हैं। यदि किसी चालक से I धारा प्रवाहित हो और उसका अनुप्रस्थ काट का क्षेत्रफल A हो, तब धारा घनत्व -

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Therefore, V = RI where R is a constant called resistance.