DC Theory Tutorials

The mesh current method is very useful for finding all the currents in a network. This method, a little more advanced, is also applied to circuits where there are resistances and reactances.

The node analysis method also known as the nodal analysis is widely used to solve linear resistive circuits (this method, in a slightly extended form, also applies to resistive-reactive circuits)

The voltage divider is a circuit that allows us to obtain an output voltage less than the input voltage. The output voltage is normally obtained across ground and the resistor connected to it, but it could be across any of the other resistors.

What does the Maximum Power Transfer Theorem say? “The maximum power transfer to the load is obtained when the load resistance RL is equal to the internal resistance of the…

Ohm’s law and electrical power. Ohm’s law relates V, I, and R. A more complete expression of Ohm’s law is achieved using the electrical power formula

When a constant voltage is suddenly applied to an RL circuit, an increasing a current goes through the conductor and creates a magnetic field that expands with the increasing current

Power is the speed at which work is done. Electric power is the multiplication of the current (amps) by the voltage (volts). P = I x V.

Direct Current (DC), is the result of the flow of electrons (negative charge) in a conductor (most of the time, wires of copper) that goes only in one direction.

Benjamin Franklin imagined the electricity as a invisible fluid. Franklin assured that if any body had more fluid than usual, it could have a positive charge, but if it had less fluid than normal it had negative charge.

Potential difference or Voltage is a kind of force that push charges through a conductor. The larger the voltage, the larger the force

Millman’s theorem is used to directly obtain the voltage between the ends of a parallel branch circuit. Equivalent Millman circuit Formulas, example.

By using the current divider rule, we can find the current in each resistor connected in parallel. The electric current passing through a circuit of two resistors in parallel is divided in two.

The Superposition Theorem

The Superposition theorem states that the effect of two or more voltage sources in a resistor is equal to the sum of the individual effects of each source taken separately, replacing all the remaining voltage sources with short circuits.