# Direct Current (DC)

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# Direct Current (DC)

## Capacitor Discharging Process (RC circuit)

Capacitor Discharge Process.

In a series RC circuit, a capacitor does not immediately discharge after being disconnected from a power source of direct current. The capacitor voltage Vc decreases from the initial voltage on the capacitor to 0 volts in some amount of time.

## DC Motor – Parts of a DC Motor. Basic Operation Principle.

DC Motor

A DC motor is composed of a stator and a rotor. In many small motors, the stator is composed of magnets. Larger motors have windings.

## What’s Static Electricity? – Examples

Static Electricity – What it is?

Static electricity is static, since it is a current that is going nowhere. Both, DC and AC current flow in some direction, but estatic electricity does not.

## Temperature effects on resistance

Temperature effects on resistance. Resistance Variation with Temperature.

The value of the resistance of a material varies with temperature change. For this reason, the circuit or system containing these elements should work in controled environment

## Energy and Electric Power. Performance

Energy and Electric power.

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.

## Resistor, Resistance and Conductance

What is a Resistor?

A Resistor is an electrical element that causes opposition to the flow of the electric current. Using the Ohm’s Law V = IxR we can find the voltage on the resistors terminals.

## Types of Cells / Batteries

Types of cells / batteries.

– Primary batteries (non-rechargeable): Dry, mercury, alkaline.

– Secondary batteries (rechargeable): Nickel-Cadmium Alkaline, Lead

Cells or Batteries interconnection

## Step Response of RL Circuits

Step Response of RL Circuits 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…

## Inductor in DC and AC. Quality factor

Inductor in DC and AC.

Phase angle of the alternating current in an Inductor,

The quality factor (Q)

## Norton’s Theorem

Norton’s Theorem The Norton’s Theorem is similar to the Thevenin’s Theorem. It can be seen that, the equivalent circuit is: A Voltage source (Thevenin voltage: Vth) in series with a resistor (Thevenin resistance: RTH) Thevenin…

## Thevenin’s theorem

The Thevenin’s theorem The Thevenin’s theorem is used to convert a two terminal complex circuit, into a very simple circuit containing only one voltage source (Vth) in series with a single resistor (RTH). See…

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