- #1
Rajeswar Panja
- 4
- 0
Why we do use electrical current density in place of total electrical current? Actually I want to know what is the advantage of using electrical current density?
We don't always use Current Density. In fact, in many years of EE, Current Density hasn't figured very highly in any of my work. Talk to a power Engineer and you may get a different answer.Rajeswar Panja said:why we do use current density
We use whichever one we need for a given problemRajeswar Panja said:why we do use current density which means current/unit area rather than the total current?
cosmik debris said:Current density is a vector, current is a scalar?
Current is in fact a scalar. The current through a surface S (e.g. a cross-section of a wire) is defined as $$I = \iint_S \vec J \cdot d\vec S$$ where ##\vec J## is the current density at each point on the surface and ##d \vec S## is the infinitesimal surface element at that point.Mgcini Keith Phuthi said:Both current and current density are vectors
Current density is a measure of the amount of electric current flowing in a specific direction through a given area. It is important because it provides a more precise and accurate measurement of electric current compared to simply measuring the total current. It also allows for the comparison of current flow in different materials or at different points within a material.
Current density is calculated by dividing the total current (I) by the cross-sectional area (A) through which the current is flowing. The formula is J = I/A, where J is current density, I is current, and A is cross-sectional area.
Current density and resistance have an inverse relationship. This means that as current density increases, resistance decreases and vice versa. This relationship is described by Ohm's law, where resistance (R) is equal to the ratio of voltage (V) to current (I), or R = V/I.
Maintaining a certain current density is important to ensure the proper functioning and longevity of electrical systems. If the current density is too high, it can lead to overheating and damage to the system. On the other hand, if the current density is too low, it can result in inefficient use of energy and potentially cause malfunctions.
The performance of electronic devices is greatly affected by current density. Higher current density can lead to faster and more efficient operation of devices. However, if the current density is too high, it can cause overheating and potentially damage the device. Therefore, it is important to carefully consider and control current density in the design and operation of electronic devices.