## Wirewound Resistor (Wire wound Resistor)

What is a wirewound resistor?

A Wirewound resistor is a resistor 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.

•
128
Shares
• 128
•
•
•
•
•
•

## Capacitor and Direct Current (DC) – Dielectric

Capacitor and Direct Current

If a battery is connected to a capacitor, it will allows no direct current (DC) to flow through. If a not charged capacitor is connected across the terminals of a battery, a transient current flows as the capacitor plates charge up.

Capacitor and Direct Current. Current starts from its maximum value and decreases to 0 amps. This current is called “transient current”.

•
128
Shares
• 128
•
•
•
•
•
•

## Superposition Theorem – Example

The Superposition Theorem

The Superposition theorem states that the effect of two or more voltage sources in a resistor is equal to the sum of the individual effects of each source taken separately, replacing all the remaining voltage sources with short circuits.

•
128
Shares
• 128
•
•
•
•
•
•

## What is Electrical Resistance? Obtaining a material’s resistance

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.

•
128
Shares
• 128
•
•
•
•
•
•

## Capacitor Discharging Process (RC circuit)

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.

•
128
Shares
• 128
•
•
•
•
•
•

## Temperature effects on 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

•
128
Shares
• 128
•
•
•
•
•
•