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# Resistors

### Wirewound Resistor

A Wirewound resistor is made with a conductive wire of a high resistivity. This wire is made of a special alloy, and it is wound on a support tube of refractory material such as ceramics, porcelain, etc.

### 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.

### 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)

### Temperature effect on resistance

Temperature effects on resistance. The value of the resistance of a material varies with temperature change. For this reason, the circuit containing these elements should work in controlled environment

### Series/Parallel Resistor Reduction

Series/Parallel Resistor Reduction. Resistors reduction can be done, making some simplifications using resistors in series and resistors in parallel formulas.

### Resistors in series and parallel (Equivalent resistor value)

Resistors in series and parallel. How to calculate resistors in series and resistors in parallel. How to calculate resistors in parallel using conductance. Formulas

### Resistor, Resistance and Conductance

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

### Resistor Tolerance. What is it? – Color code

Resistor tolerance is data that tells us the percentage that can vary the resistor value of its proposed value. This variation may go up or down in the percentage specified tolerance.

### LDR – Photoresistor

What is an LDR – Photoresistor? LDR (Light Dependent Resistor) is light sensitive resistor whose resistance changes with the light intensity that falls upon it.

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