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Why we should have difference between dc and ac resistance?
Resistance is inversely-proportional to the cross-sectional area of a conductor. When a d.c. current flows, the charge carriers distribute themselves across the whole of the conductor's cross-section. When a.c. current flows, due to something called the 'skin effect', the charge carriers tend to flow towards the surface of the conductor -thus reducing the effective cross-sectional area of the conductor. So, the resistance to a.c. is higher than the resistance to d.c. At mains' frequencies (50/60 Hz), the 'skin effect' is relatively low, but the effect increases significantly with an increase in frequency. So the difference between 'd.c. resistance' and 'a.c. resistance' increases as the frequency increases.
When the length and area of cross section both are doubled then its resistance?
The answer depends on whether the cross sectional radius/diameter are doubles or the cross sectional area is doubled.
What are the factors affecting the resistance of conductors?
Conductor resistance = Conductor resistivity * Length of conductor / Cross sectional area of conductor. So. It is directly proportional to material & conductor length. And inversely proportional to the cross sectional area of conductor.
State the factors affecting resistance of materials?
The resistance of materials is primarily affected by temperature, material composition, length, and cross-sectional area. As temperature increases, resistance typically increases for most conductors. Additionally, materials with higher resistivity, such as insulators, exhibit greater resistance. The length of the conductor directly impacts resistance, with longer materials having higher resistance, while a larger cross-sectional area reduces resistance.
Which winding has more resistance and why?
In general, a longer winding has more resistance than a shorter winding, assuming the same material and cross-sectional area are used. This is because resistance is directly proportional to the length of the conductor and inversely proportional to its cross-sectional area, according to the formula ( R = \frac{\rho L}{A} ), where ( R ) is resistance, ( \rho ) is resistivity, ( L ) is length, and ( A ) is the cross-sectional area. Therefore, if comparing two windings of the same material and thickness, the longer winding will inherently have higher resistance.
What effects the restance of an electrical conductor?
The resistance of an electrical conductor is primarily affected by its length, cross-sectional area, and the material it is made of. Longer conductors have higher resistance, while conductors with larger cross-sectional areas have lower resistance. Different materials have different resistivities, which also affect resistance.
How does cross sectional area affect resistance?
the larger the cross sectional area, the smaller the resistance
What is the relationship between resistance and cross-sectional area in a conductor?
The relationship between resistance and cross-sectional area in a conductor is inversely proportional. This means that as the cross-sectional area of a conductor increases, the resistance decreases, and vice versa. This relationship is described by the formula: Resistance (resistivity x length) / cross-sectional area.
How does a resistance of a wire depend on its radius?
Resistance is inversely-proportional to the cross-sectional area of a conductor. For example, doubling its cross-sectional area will halve its resistance, while halving its cross-sectional area will double its resistance.Since the cross-sectional area of a circular-section conductor is proportional to the square of its radius, doubling that radius will reduce its resistance by one quarter, while halving its radius will quadruple its resistance.
How does the cross sectional area of wire affect resistance?
Other things being equal, more cross-sectional area will cause less resistance.
What three things affect the resistance in a wire?
The three main factors that affect the resistance in a wire are the material of the wire (different materials have different resistivities), the length of the wire (longer wires have higher resistance), and the cross-sectional area of the wire (thicker wires have lower resistance).
Is the resistance of the wire directly or inversely proportional to the cross-sectional area of the wire?
The resistance of a wire is inversely proportional to the cross-sectional area of the wire. This means that as the cross-sectional area of the wire increases, the resistance decreases, and vice versa.
What can affect the resistance of a wire?
The resistance of a wire can be affected by its length, cross-sectional area, material, and temperature. Longer wires have higher resistance, while thicker wires have lower resistance. Different materials have different resistivities, impacting resistance. Temperature can also influence resistance, with most materials increasing in resistance as temperature rises.
What effect will the cross-sectional area of the conductor have on the resistance of a conductor?
The cross-sectional area of a conductor is inversely proportional to the resistance of the conductor. Increasing the cross-sectional area decreases the resistance, as it allows more space for electrons to flow through, reducing collisions and increasing conductivity. Alternatively, decreasing the cross-sectional area increases resistance, as there is less area for electrons to flow through, leading to more collisions and increased resistance.
Does resistance increase as the cross-sectional area of the wire?
the resistance can never increase or decrease....... (you can't open the resistor and take out the something and make the resistance increase or decrease)AnswerSince resistance is directly proportional to the length of a conductor, increasing the length of a wire will increase its resistance. For example, if you double its length, you will double its resistance.
What is difference between ac and dc resistance?
Resistance is inversely proportional to the cross-sectional area of a conductor.With d.c., the charge carriers distribute themselves across the full cross-section of the conductor. However, with a.c., a property called the 'skin effect' (which increases with frequency) causes the charge carriers to drift closer towards the surface of the conductor. Accordingly, effective cross-sectional area of the conductor is reduced, and its effective resistance increases.So the a.c. resistance of a conductor is somewhat is higher than d.c. resistance -how much higher depends on the frequency of the supply.Do not confuse a.c. resistance with reactance, which is a completely different property.
What are three things resistance of a wire depends on?
The resistance of a wire depends on its length - longer wires have higher resistance. It also depends on the material of the wire - materials with higher resistivity have higher resistance. Lastly, the cross-sectional area of the wire affects resistance - larger cross-sectional areas have lower resistance.
