Quick Answer: What Are The Factors That Affect Resistance?

How do you test the resistance of a wire?

Set your multimeter to the highest resistance range available.

The resistance function is usually denoted by the unit symbol for resistance: the Greek letter omega (Ω), or sometimes by the word “ohms.” Touch the two test probes of your meter together.

When you do, the meter should register 0 ohms of resistance..

What is a specific resistance?

Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied.

What is resistance and what factors affect it?

There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material. When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms.

What are the factors affecting resistivity?

Then the factors which affect the resistance (R) of a conductor in ohms can be listed as:The resistivity (ρ) of the material from which the conductor is made.The total length (L) of the conductor.The cross-sectional area (A) of the conductor.The temperature of the conductor.

What are the factors affecting resistance class 10?

Factors Affecting Electrical ResistanceThe cross-sectional area of the conductor.Length of the conductor.The material of the conductor.The temperature of the conducting material.

Does resistivity depend on length and area?

It is a property of the material itself, and depends on temperature. The resistance of an object is proportional to the resistivity of the material it is made from, proportional to the object’s length, and inversely proportional to the object’s cross-sectional area.

Why resistance decreases with increase in area?

when cross section increase, surface area of wire increase. More surface area leads to free flow of electrons. so electron flow easily and resistance decrease. … Hence resistance decreases.

What is meant by resistance class 10?

Resistance is a property of conductor due to which it resists the flow of electric current through it. Variable Resistance: The component of an electric circuit which is used to regulate the current; without changing the voltage from the source; is called variable resistance. …

What is called resistance?

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.

How the length of a wire affects the resistance?

First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. … More collisions mean more resistance. Second, the cross-sectional area of the wires will affect the amount of resistance.

How does resistance depend on length and area?

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor. See resistivity. The resistance of a conductor, or circuit element, generally increases with increasing temperature.

What is the difference between resistance and resistivity?

Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions. … Resistivity is only proportional to the nature and temperature of the particular material.

How do you reduce resistance in a wire?

Of course there exist many different ways to reduce the resistance, such as using a thicker wire (increase the cross section area), lowering the temperature, or even changing the material.

What are the 4 factors affecting the resistance of a conductor?

There are 4 different factors which affect resistance:The type of material of which the resistor is made.The length of the resistor.The thickness of the resistor.The temperature of the conductor.

Why resistance is directly proportional to length?

As the length increases, the number of collisions by the moving free electrons with the fixed positive ions increases as more number of fixed positive ions are present in an increased length of the conductor. As a result, resistance increases.

What are the 3 factors that affect resistance?

There are several factors that affect the resistance of a conductor;material, eg copper, has lower resistance than steel.length – longer wires have greater resistance.thickness – smaller diameter wires have greater resistance.temperature – heating a wire increases its resistance.

What happens to resistance when current increases?

The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.

How do I calculate resistance?

If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.