# Relationship between resistance and area

### Copper and electricity. Resistance and resisitivty. In effect, the resistivity represents the resistance across two opposite faces of a A wire made of a copper alloy is 5 m in length and has a cross-sectional area 1. Consider a uniform wire of cross-sectional area \$A\$ and length \$L\$ made of some conducting material. Suppose that the potential difference between the two . Â· A = Area of cross - section of the conductor (mÂ²) Â· Ï = the Essay about Relationship Between the Resistance and the Length of a Wire. - Relationship.

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.

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.

## Resistance

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. In hydraulics, it is similar: The pressure difference between two sides of a pipe, not the pressure itself, determines the flow through it.

For example, there may be a large water pressure above the pipe, which tries to push water down through the pipe. But there may be an equally large water pressure below the pipe, which tries to push water back up through the pipe. If these pressures are equal, no water flows. In the image at right, the water pressure below the pipe is zero. The resistance and conductance of a wire, resistor, or other element is mostly determined by two properties: In the same way, a long, thin copper wire has higher resistance lower conductance than a short, thick copper 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.

## Current, voltage and resistance

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.

### Electrical resistance and conductance - Wikipedia

Substances in which electricity can flow are called conductors. The methods used in the designed experiment are detailed in my paper. However, a summary of the method is given here in order to provide the reader with context. Two sizes of spheres, 15 cm and 30 cm diameter Figure 1were selected to represent the minimum and maximum sizes used in electrofishing; these were also the diameters of rings used.

Two lengths of rods, 48 and 96 cm, equal to the circumference of the rings, were also selected. Rings and rods were constructed with four diameters of stock diameter material thickness: This resulted in 18 combinations of size, shape and stock diameter: The pairs of cm and cm sphere electrodes used in the study.