on which factor resistance in dependent and calculate the formula with unit
Answers
Answer:
ANSWER
(a) The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature.
Resistivity is defined as the measure of the resisting power of a specified material to the flow of an electric current.
R=ρ
A
l
where R = Resistance of the conductor
ρ = Resistivity of the conductor
l = length of the conductor
A = Area of cross section
i.e., ρ=R
l
A
Unit of resistivity is Ωm.
(b) In the given circuit, the two 2Ω resistors are in series with each other and these resistors are in parallel with other two 2Ω resistors which are in series with each other.
R
1
=2+2=4Ω
R
2
=2+2=4Ω
Total resistance, R=
R
1
+R
2
R
1
×R
2
=
4+4
4×4
=2Ω
Total current flowing in the circuit, I=
R
V
=
2
6
=3A
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Answer:
formula of calculating resistance:-
The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: 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.