Counter-electromotive force or Back-electromotive force

The voltage of a DC motor is divided into a voltage in the windings resistance and a voltage called Counter-electromotive force

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.

The Magnetic Field. Magnetic Field Lines

Magnets. Charges in motion (electric current) behave like magnets (produce magnetic fields)

XOR logic gate

In digital electronics there are special gates. One of them is the XOR logic gate or exclusive OR gate. Equivalent XOR Logic Gate using common logic gates

Sequential Circuits Using Logic Gates

The main difference between combinational circuits and sequential circuits is that in sequential circuits there is one or more output signals fed back to one or more inputs to obtain a new output.

Combinational Circuit Using Logic Gates

A combinational circuit is a circuit where the output depends only on the combination of the inputs at the time we are testing the output

AC motor (AC Electric Motor)

One of the characteristics of an AC motor is the number of rotor poles. This data will automatically give the number of windings that the motor has: # windings = # poles x 2.

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.

The Power Supply block Diagram Many electronic circuits need a direct current (DC) voltage source, but what we commonly find are voltage sources of alternating current (AC). In order to achieve a direct current voltage source, the alternating current input must follow a convertion process like the one shown in the chart below. The chart shows the operation of a voltage […]

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.