# What relationship exists between wire resistance and its diameter

### The relationship between the resistance of a wire and its thickness

There is a direct relationship between the amount of resistance encountered by . The gauge wire has a diameter of 1/12 inch while the gauge wire has a . This Wire Wisdom covers the basics of American Wire Gauge (AWG) from definition, The relationship between gauge sizes is not linear, but logarithmic. The area of a conductor is found by squaring its diameter in mils. The electrical resistance of a stranded conductor is a function of the length of lay and is larger than. inversely proportional.. resistance is directly proportional to length and inversely proportional to the length of the wire.

Materials are important as well. A pipe filled with hair restricts the flow of water more than a clean pipe of the same shape and size.

Similarly, electrons can flow freely and easily through a copper wire, but cannot flow as easily through a steel wire of the same shape and size, and they essentially cannot flow at all through an insulator like rubberregardless of its shape.

The difference between copper, steel, and rubber is related to their microscopic structure and electron configurationand is quantified by a property called resistivity.

In addition to geometry and material, there are various other factors that influence resistance and conductance, such as temperature; see below. Conductors and resistors[ edit ] A 6.

An ohmmeter could be used to verify this value. Substances in which electricity can flow are called conductors. A piece of conducting material of a particular resistance meant for use in a circuit is called a resistor. Conductors are made of high- conductivity materials such as metals, in particular copper and aluminium.

Resistors, on the other hand, are made of a wide variety of materials depending on factors such as the desired resistance, amount of energy that it needs to dissipate, precision, and costs. Ohm's law The current-voltage characteristics of four devices: Two resistorsa diodeand a battery.

The horizontal axis is voltage dropthe vertical axis is current. Ohm's law is satisfied when the graph is a straight line through the origin. Therefore, the two resistors are ohmic, but the diode and battery are not. It must be understood that both units are valid for measuring the area of a shape, no matter what shape that may be. The conversion between circular mils and square mils is a simple ratio: The gauge scale is based on whole numbers rather than fractional or decimal inches.

The larger the gauge number, the skinnier the wire; the smaller the gauge number, the fatter the wire. For those acquainted with shotguns, this inversely-proportional measurement scale should sound familiar. The table at the end of this section equates gauge with inch diameter, circular mils, and square inches for solid wire. The larger sizes of wire reach an end of the common gauge scale which naturally tops out at a value of 1and are represented by a series of zeros.

Other wire gauge systems exist in the world for classifying wire diameter, such as the Stubs steel wire gauge and the Steel Music Wire Gauge MWGbut these measurement systems apply to non-electrical wire use.

This is a handy rule to remember when making rough wire size estimations!

## Resistance

Stranded wire construction is favored, instead. In these instances, thick bars of solid metal called busbars are used as conductors. See Answer A gauge wire is wider than gauge wire and thus has less resistance. The lesser resistance of gauge wire means that it can allow charge to flow through it at a greater rate - that is, allow a larger current.

### Conductor Size | Physics Of Conductors And Insulators | Electronics Textbook

Thus, gauge wire is used in circuits which are protected by Amp fuses and circuit breakers. On the other hand, the thinner gauge wire can support less current owing to its larger resistance; it is used in circuits which are protected by Amp fuses and circuit breakers.

Based on the information stated in the above question, explain the risk involved in using gauge wire in a circuit that will be used to power an ampere power saw. Thus, gauge wire can safely support a circuit that uses an appliance drawing up to 20 Amps of current.

In fact, a Amp circuit is protected by a fuse or circuit breaker that will flip off when the current reaches 20 Amps. If a gauge wire was used on the same circuit, then the breaker would allow up to 20 Amps to flow through it. It could overheat and thus lead to the risk of fire.

A Amp circuit should never be wired using gauge wire.