What the equation for Ohms Law?

Answer 1

Ohm's Law states that, for a passive element, V (the voltage drop) is proportional to I (the current in the component), and the proportional constant is R (the resistance). Namely, V = R * I.

For DC operations in a passive element, Ohm's Law is dealing with scalar quantities. For AC, V and I become vectors (phasors) for Ohm's Law to be valid.

A passive element is an electrical component that does not have gain, voltage gain or current gain. Examples are resistors, capacitors, inductors, diodes, and Transformers.

An active element is one that has gain. Examples are transistors (MOSFET, bipolar, and JFET). A solar cell is an active element. Although Ohm's Law does not apply to transistors, the Law still can apply to the passive components of transistors, if we represent the transistor with passive elements and active elements.

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