What is Direct Current? – DC
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.
Apr 162019
Apr 152019
What is Electrical Resistance? Obtaining a material’s resistance
The electrical resistance is a measurement of the opposition that offers a material to the passage of electrons (the electric current). When a material, such as metals has many free electrons, it allows the easy flow of electrons and it is called conductor.
Apr 122019
A Time Delay Light switch circuit
This circuit is useful to illuminate locations where a light source of low power is needed. A closet, a car trunk, are good examples.
Apr 122019
The Semiconductor Diode
The semiconductor diode is the simplest semiconductor device and can be found in almost any electronic circuit. Diodes are manufactured with germanium and silicon (the most common).
Apr 102019
What is Joule’s Law?
It is known as Joule effect to the phenomenon by which if in a wire circulates an electrical current, part of the energy is transformed into heat. This law (Joule’s Law) is named after the British physicist James Prescott Joule.
Apr 092019
Police Style Strobe Light Circuit.
This circuit shows the familiar lights which are used on police cars. It uses a 555 timer as a clock for the 4017B decade counter, two transistors and twelve LEDs
Apr 082019
Logic Probe using NOT Gates (Inverters)
This logic probe using NOT Gates is implemented with three NOT gates, one rectifier diode, two LEDs and two resistors.
Apr 042019
Second Right-Hand Rule – Electromagnetism
Second Right-Hand Rule. When a current flows through a conductive wire a non-visible effect called the electromagnetic field is generated around it.
Apr 032019
What is Electrical Resistivity?
Electrical resistivity [ρ] (rho) is a characteristic of materials and has ohm-meter unit. Resistivity indicates how much the material opposes the flow of electric current.
Apr 022019
Why is there a diode connected in parallel to a relay coil?
The purpose of a diode connected in parallel to a relay coil (flywheel diode or freewheeling diode) is to avoid damaging some nearby components sensitive to high voltage.
Apr 012019
How to test Diodes and how to test Transistors
Method to follow to to test a diode or transistor to know if they are working fine
Mar 262019
How to Make a Diode Tester Circuit using 741?
This diode tester circuit checks if the diode is in good condition and also determines its polarity. To accomplish our goal, we use an 741 operational amplifier (IC1) configured as an oscillator.