Advertisements
Advertisements
рдкреНрд░рд╢реНрди
How does the resistance of a wire depend on its radius? Explain your answer.
Advertisements
рдЙрддреНрддрд░
Resistance of a wire is inversely proportional to the area of cross-section of the wire.
`R ∝ 1/"r"^2 or R prop 1/"a" or R ∝ 1/"ЁЭЬЛЁЭСЯ"^2`
where 'a' is the area of cross-section and r is the radius of wire and R is the resistance. In other words thick wire offers less resistance and thin wire offers more resistance. In thick conductor electrons suffer less collisions.
APPEARS IN
рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНтАНрди
How does the resistance of a wire depend on its length? Give a reason for your answer.
Assertion (A): Copper is used to make electric wires.
Reason (R): Copper has very low electrical resistance.
What happens to the resistance, as the conductor is made thicker?
What is resistance?
______ is the only non-metal that is a good conductor of electricity.
If the area of cross-section of the conductor is doubled its resistance gets ______.
Three resistors are connected in parallel with a battery. If the current in each resistor is 2A, then the current through the battery will be ______.
The ______ is the measure of opposition offered by the component to the flow of electric current through it.
Define the following:
Variable resistor
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more specific resistance?
