How to use a Resistor - Basic electronics engineering On video

 

How to use a Resistor - Basic electronics engineering

Resistance is a measure of the opposition applied to current in an electrical circuit.

Resistance is measured in ohms, the unit of which is symbolized by the Greek letter omega (Ω). This unit refers to the German physicist Georg Simon Ohm (1784-1854) who studied the relationship between voltage, current and resistance. He discovered the law that bears his name, Ohm's law.

All materials offer resistance to current to some extent. They fall into two categories:

Conductors: materials that offer very little resistance and through which electrons can move easily. Examples: silver, copper, gold and aluminum.
Insulators: materials that offer high resistance and restrict the flow of electrons. Examples: rubber, paper, glass, wood and plastic.
Conductors / Insulators
Gold cables are an excellent conductor.
Resistance measurements are normally taken to indicate the condition of a component or circuit.

The higher the resistance, the less current flows. If it is abnormally high, it could indicate (among other things) that conductors are damaged due to overheating or corrosion. All conductors generate heat to some extent. Overheating is therefore a problem often associated with resistance.
The lower the resistance, the more current flows. Possible causes: insulation damaged by humidity or overheating.
The resistance of many components, such as thermal elements and resistors, has a fixed value. These values ​​are often printed on the component plate or in reference manuals.

When a tolerance is specified, the measured resistance value must fall within the specified resistance range. Any significant variation from a fixed resistance value usually signals a problem.

The term "Resistance" may have a negative connotation, but in the field of electricity it is very useful.

Examples: the current must struggle to pass through the small windings of a toaster in order to generate heat to toast the bread. Old incandescent bulbs force current through filaments so fine that they generate light.

Resistance cannot be measured in an operating circuit. So technicians performing troubleshooting most often calculate resistance by taking voltage and current measurements and applying Ohm's Law:

E = I x R

 

How to use a Resistor - Basic electronics engineering

Resistance is a measure of the opposition applied to current in an electrical circuit.

Resistance is measured in ohms, the unit of which is symbolized by the Greek letter omega (Ω). This unit refers to the German physicist Georg Simon Ohm (1784-1854) who studied the relationship between voltage, current and resistance. He discovered the law that bears his name, Ohm's law.

All materials offer resistance to current to some extent. They fall into two categories:

Conductors: materials that offer very little resistance and through which electrons can move easily. Examples: silver, copper, gold and aluminum.
Insulators: materials that offer high resistance and restrict the flow of electrons. Examples: rubber, paper, glass, wood and plastic.
Conductors / Insulators
Gold cables are an excellent conductor.
Resistance measurements are normally taken to indicate the condition of a component or circuit.

The higher the resistance, the less current flows. If it is abnormally high, it could indicate (among other things) that conductors are damaged due to overheating or corrosion. All conductors generate heat to some extent. Overheating is therefore a problem often associated with resistance.
The lower the resistance, the more current flows. Possible causes: insulation damaged by humidity or overheating.
The resistance of many components, such as thermal elements and resistors, has a fixed value. These values ​​are often printed on the component plate or in reference manuals.

When a tolerance is specified, the measured resistance value must fall within the specified resistance range. Any significant variation from a fixed resistance value usually signals a problem.

The term "Resistance" may have a negative connotation, but in the field of electricity it is very useful.

Examples: the current must struggle to pass through the small windings of a toaster in order to generate heat to toast the bread. Old incandescent bulbs force current through filaments so fine that they generate light.

Resistance cannot be measured in an operating circuit. So technicians performing troubleshooting most often calculate resistance by taking voltage and current measurements and applying Ohm's Law:

E = I x R