Information about Node (circuits)
In electrical engineering, node refers to any point on a circuit where the voltage is the same. Without any further knowledge, it is easy to establish how to find nodes by using Ohm's Law: V=IR. When looking at circuit schematics, ideally wires have a resistance of zero (this is not true in real life, but it is a good assumption.) Since it can be assumed that there is no change in the potential across any part of the wire, ALL of the wire in between any components in a circuit is considered part of the same node.
Voltage = Current * Resistance
since voltage is a measure of potential difference the voltage between any two parts of the same wire is:
Vab= (Current) * 0
So at any 2 points on the same wire, the change in potential difference is 0. Therefore, throughout the entire wire between components (the node itself,) the voltage is the same.
In this circuit diagram the voltage in the green node is the same throughout, likewise, the voltages in the blue node, and the red node are the same throughout.
In most cases, the voltage difference between one point on a piece of metal (such as a copper wire), and the voltage at another point of the same piece of metal or on other bits of metal with metal-to-metal contact with the first piece of metal, is so small that it is usually considered insignificant. So every bit of that connected metal can be considered part of the same node.
Some notable exceptions, where the voltage difference is large enough to become significant, include:
Voltage = Current * Resistance
since voltage is a measure of potential difference the voltage between any two parts of the same wire is:
Vab= (Current) * 0
So at any 2 points on the same wire, the change in potential difference is 0. Therefore, throughout the entire wire between components (the node itself,) the voltage is the same.
In this circuit diagram the voltage in the green node is the same throughout, likewise, the voltages in the blue node, and the red node are the same throughout.
In most cases, the voltage difference between one point on a piece of metal (such as a copper wire), and the voltage at another point of the same piece of metal or on other bits of metal with metal-to-metal contact with the first piece of metal, is so small that it is usually considered insignificant. So every bit of that connected metal can be considered part of the same node.
Some notable exceptions, where the voltage difference is large enough to become significant, include:
- high-precision resistance measurements using four-terminal sensing Kelvin connection
- the difference in voltage between ground and neutral, between the "neutral wire" and the "safety ground in a domestic AC power plugs and sockets, can be fatal. A properly installed electrical system connects them together at one (and only one) location, leading many people to the fatally incorrect conclusion that they are at "the same" voltage, or that the safety ground is "redundant and unnecessary".
- the Seebeck effect and the Peltier effect
- joints involving aluminium wire
Electrical engineering (sometimes referred to as electrical and electronic engineering) is an engineering field that deals with the study and/or application of electricity, electronics and electromagnetism.
..... Click the link for more information.
..... Click the link for more information.
Ohm's law states that, in an electrical circuit, the current passing through a conductor between two points is proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them.
..... Click the link for more information.
..... Click the link for more information.
In physics, the potential difference is a quantity related to the amount of energy that would be required to move an object from one place to another against various types of forces.
..... Click the link for more information.
..... Click the link for more information.
In physics, the potential difference is a quantity related to the amount of energy that would be required to move an object from one place to another against various types of forces.
..... Click the link for more information.
..... Click the link for more information.
circuit diagram (also known as an electrical diagram, elementary diagram, or electronic schematic) is a simplified conventional pictorial representation of an electrical circuit.
..... Click the link for more information.
..... Click the link for more information.
Four-terminal sensing (4T sensing) is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements than traditional two-terminal (2T) sensing.
..... Click the link for more information.
..... Click the link for more information.
ground and neutral are closely related. Under certain conditions, a conductor used to connect to a system neutral is also used for grounding (earthing) of equipment and structures.
..... Click the link for more information.
..... Click the link for more information.
neutral wire is a conductor within an alternating current (AC) electrical distribution system which is intended to carry current and is also intended to be connected to earth (UK and EU) or ground (USA).
..... Click the link for more information.
..... Click the link for more information.
In electrical engineering, the term ground or earth has several meanings depending on the specific application areas. Ground is the reference point in an electrical circuit from which other voltages are measured, a common return path for electrical current (
..... Click the link for more information.
..... Click the link for more information.
Domestic power plugs and sockets are devices that connect the home appliances and portable light fixtures commonly used in homes to the commercial power supply so that electric power can flow to them.
..... Click the link for more information.
..... Click the link for more information.
Aluminium wire is a type of wiring used in houses and power grids.
..... Click the link for more information.
History
Usage within utilities
Since the early 1900s, utility companies have been using aluminium wire for transmission of electricity within their power grids...... Click the link for more information.
This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.
Herod_Archelaus
