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Ohm's law and power law.

Any driver of the current is symbolized by a resistor.

The resistance of a conductor which measures the opposition to current flow.
This resistance depends on the drivers and their dimensions.
The unit of resistance is the Ohm.


If we make the ratio the voltage and current the result is constant and equal to the resistance of the conductor.

power law.

power is called a device that transforms energy per unit time. It is measured in Watts (W).

P = V ‡ I

All sections have a maximum power that can be applied before breaking. For example, check that the resistance of our circuits can withstand a maximum 2w.
current passing through conductors produce heat (Joule effect).


SERIES CIRCUIT CALCULATIONS.

How much current circulates through a series circuit?

I = V / Re = 9 / 20 = 0.45A = 450mA


CALCULATION OF THE INTENSITY OF A PARALLEL CIRCUIT.

To calculate the equivalent resistance of a parallel circuit of 2 elements are multiplied together and divided by their sum.

Re = R1 R2 / R1 + R2