Question

Write the formula for the following terms with expansion and unit. 

(a)Current
(b) Power      
(c) Ohm's law    
(d) Resistivity

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Answer 1

Answer:

Current is usually denoted by the symbol I.

Power

W / t or Work / time

For Ohm's law

V=IR or voltage= current× resistance

Resistivity

ρ = RA/l

Explanation:

Hope it will help you

Answer 2

Explanation:

a) Current = q/ t

where q= charge ,q= ne ( n= no. of electron ,e= charge of an electron)

Electric current is define as no. of electric charege flow through a conductor in a time interval is called electric current.

SI unit of Current = A (ampere)

b) Power= Vl

V= volt

l= electic current

Sl unit = watt

c) At constant temperature, the potential difference V across the end of a given the metallic wire in an electric circuit is directly proportional to the current flowing through it.

V proportion to I

V= RI

where R= resistance of conductor

Sl unit is ohm

d)resistivity at various material is define as resistance of unite cube of that material.

p= m/ne^2™