Resistors in series and parallel How to obtain equivalent resistor value of resistors in series To implement a circuit with resistors in series you have to connect one resistor after the other one. (see the image). The equivalent resistor value of the resistors connected in series is equal to the addition of all resistor’s values. In this […]

First Right Hand Rule

The First Right Hand Rule or (Magnetic Force induced on a Current-Carrying Wire) says that if a current-carrying wire is in the presence of a magnetic field, a force is exerted on the wire.

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.

The capacitor charging process

The capacitor charging process shows the variation of voltage and current in the capacitor over time, when it is connected to a DC voltage source

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.

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.

Internal resistance of a voltage source

Voltage sources, whether batteries, generators, etc., are not ideal (perfect). A real voltage source is composed of an ideal voltage source in series with a resistance called internal 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.

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.

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.

Ohm’s Law relates in one equation the voltage, the current and resistance. Resistance = Resistor’s value.

A more complete expression of Ohm’s Law is achieved using the electric power formula

Types of cells / batteries.

– Primary batteries (non-rechargeable): Dry, mercury, alkaline.
– Secondary batteries (rechargeable): Nickel-Cadmium Alkaline, Lead

Cells or Batteries interconnection