Bihar Police Constable Model Paper 7

CONCEPT:

Ohm’s law: The Current through the metallic element is directly proportional to the potential difference when the temperature remains constant

V = (I/R) [where v= potential difference, I = current, R = resistance].

Resistance: It is a measure of how the device reduces the flow of electric current, basically it opposes the flow of charges.

• Further, it states the ratio of applied voltage to electric current flows through it.
• R = (V/I) [R is resistance, V is the potential difference and I is electric current].
• Also, R = ρ × (L/A) [where ρ is specific resistance of a material, l is the length of conductor and A is the cross-sectional area of the conductor].
• The unit of resistance is volt/ampere or ohm (Ω)