The resistance of a given piece of wire depends of three factors: the length of the wire, the cross-sectional area of the wire, and the resistivity of the material composing the wire. To understand how this works, think of water flowing through a hose.
On what factors does the specific resistance of the wire depend?
Answer: The specific resistance of a wire depends on the temperature and the material that is used in the wire.
What are four things that resistance in a wire depends on?
Resistance is the property of the material that restricts the flow of electrons. 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.
What causes electrical resistance in a wire?
An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance. The relationship between resistance and wire length is proportional .
What does the resistance depends on?
Resistance depends on an object’s size, shape, and material. In Figure 3 below, the cylinder’s resistance is directly proportional to its length l. The longer the cylinder, the higher the resistance. Additionally, the resistance is inversely proportional to the cross sectional area A.
What will increase the resistance of a wire?
Increasing the cross-sectional area of the wire will increase the resistance of the wire.
How does the resistance of a wire depends on its radius?
We know that the resistance of a wire is inversely proportional to the cross-sectional area of the wire. This means that the resistance of the wire and radius of the wire is inversely proportional to each other. Therefore, as the radius increases, the resistance of wire decreases.
How does a resistance and B specific resistance of a wire depend on its I length and II radius?
Resistance is directly proportional to the length and inversely proportional to the square of radius. Specific resistance is independent on the dimensions of a wire.
What are the factors affecting electric current?
What factors affect the size of an electric current?
- Potential Difference between ends (Voltage)
- Temperature.
- Material of wire.
- Length of wire.
- Area of Cross- section.
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.
Does the electrical resistivity of a wire depend on its length or diameter?
its length – the longer the wire, the greater its resistance. its cross-sectional area A – the greater the area, the less its resistance. the resistivity of the material r – the greater the resistivity, the greater its resistance.
Does resistance depend on current?
Resistance is the property of the material and does not depend upon current and potential difference. It only depends upon the length, cross-sectional area, and material used in it.
What are four things affect the resistance of a wire?
LENGTH OF WIRE
What affects the resistance of a wire?
There are four factors that affect the resistance of a wire: This means that the ‘electric slope’ that makes the electrons move gets less steep as the wire gets longer, and the average drift velocity of electrons decreases. The correct term for this ‘electric slope’ is the potential gradient.
How do you calculate the resistance of a wire?
Theoretically it is using the formula R=Ro*l/A where R is the resistance of the wire,l is its length and A is the area of cross section. Ro is the resistivity. Ro=R*A/l. If you want to measure resistivity practi ally, you have to first find the resistance of the wire using ‘metre bridge’ technique.
What increases resistance in a wire?
Decreasing the resistivity of the material the wire is composed of will increase the resistance of the wire. Increasing the resistivity of the material the wire is composed of will increase the resistance of the wire. Increasing the length of the wire will increase the resistance of the wire.
