Why would you want resistance in a wire?

Resistance is what restricts the movement of the charge through the wire. The reason for resistance in wire is because of the composition of the atoms such as copper, aluminum, of which a particular wire is made of and the arrangement of the atoms of these metals.

Why is it better to use a cable with a low resistance than a cable with a high resistance?

In most applications, a lower resistance means less power is converted to heat and lost to the surrounding environment and more of the supplied power gets to its intended destination. It also means that the wire and cable will run cooler and the power source can be smaller for a given load.

Is a resistor necessary?

They may be small and often built-in to other components, but resistors are essential to almost every electrical circuit. These hidden resistors are essential because they control the flow of the electrical current to sensitive components, and they protect components from voltage spikes.

What makes a good resistor?

Metal film resistors possess good noise characteristics and low non-linearity due to a low voltage coefficient. Also beneficial are their tight tolerance, low temperature coefficient and long-term stability.

Can you replace a 0 ohm resistor with a wire?

Zero-ohm resistors have several benefits over a simple bit of cable: They can be used as a wire link and can be inserted automatically by PCB assembly robots.

What would have the greatest effect on resistance of a wire?

The longer the wire, the more resistance that there will be. Second, the cross-sectional area of the wires will affect the amount of resistance. Wider wires have a greater cross-sectional area. Water will flow through a wider pipe at a higher rate than it will flow through a narrow pipe.

Which is a better metal to use for less resistance in a wire?

A silver wire has a lower resistance than a lead wire*.

Why is a high resistance wire sometimes better?

Resistance wire is used to control the amount of current in a circuit. High resistivity is better since a shorter wire can then be used. When the stability of the resistor is of primary importance the alloy’s temperature coefficient of resistivity and corrosion resistance are very important in material selection.

What happens if there is any resistance in voltage measurement wires?

Any resistance in these voltage measurement wires does not have any effect on the voltage measurement because it is a very high impedance measurement. There is practically no current in these wires and even though there would be resistance, it does not cause any voltage drop, so there is no error.

What is the relationship between electrical resistance and conductivity?

Resistivity and Conductivity The electrical resistanceof a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.

How do you measure the resistance of a resistor?

For example, if there is a 1 mA (0.001 A) current going through a resistor and there is a voltage drop of 0.100 V over the resistor, then the resistor is R=U/I = 0.100 V / 0.001 A = 100 ohm. So, the resistance meter actually measures the resistance via the current and voltage measurement.

Can ohm’s law be used to predict the behavior of resistors?

If the resistance is constant over a considerable range of voltage, then Ohm’s law, I = V/R, can be used to predict the behavior of the material. Although the definition above involves DC current and voltage, the same definition holds for the AC application of resistors.