What is electrical resistivity? derive its SI unit. In AC electrical circuit comprises a resistor made up of a metallic wire the 100 M A. If the length of the wire is doubled how will the current in the circuit change. justify your answer.
Answers
Explanation:
1)Electrical resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ.2)A low resistivity indicates a material that readily allows the flow of electriccurrent. Resistivity is commonly represented by the Greek letter ρ (rho).The SI unit of electrical resistivity isthe ohm-metre (Ω⋅m).3)In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 100mA. The reading of the ammeter decreases to half when the length of the wire is doubled. ... Hence according to ohms law for a given potential difference, the current reduces to half.
Answer:
electrical resistivity of a material is the resistance of a conductor of this material of unit length and unit area of crossed section.
It's SI unit is ohm metre.
if the length of the wire isdoubled resistance would also doubled and less current would follow through Circuit.
Explanation:
because resistance is directly proportional to length of conduct and indirectly proportional to area of crossed section.
less current would follow because resistance is also indirectly proportional to current follow through conductor.