Electrical Engineer

  # Ohms Law Ans:  Ohm’s law shows a simple relation between these three quantities.    Ohm's law  states that the current through a conductor between two points is directly proportional to the voltage across the two points. Ohm’s Law Formula Voltage= Current× Resistance V= I×R V= voltage, I= current and  R= resistance The SI unit of resistance is   ohms   and is denoted by  Ω Limitation Of Ohms Law : 1. Ohm's law does not apply to unilateral electrical components such as diodes as well as transistors even though they only permit current just to flow in one way. 2.V.oltage level will not be constant with respect to time for non-linear electrical components with properties such as capacitance, resistance, and so on, making Ohm's law problematic to apply.

  Why does resistance increase instead of decrease when the temperature is increased on the conductor? Ans: We know that there are free electrons in conductors which are responsible for the flow of electric current. When we apply the external electric field these electrons are moving in between the remaining fixed electron of the conductor and electrons moving opposite to the direction of the outward applied electric current. When the temperature is low the electrons move a fixed path without disturbing but when the temperature increases remaining fixed electrons (which are settled in orbit) create a vibration at a high amount due to this free electrons have difficulty moving and they collide with fixed electrons.                                  One also a relation between resistance and temperature    ...