Devices and Symbols INEL 15 040

Short Circuit

A failure in an electrical circuit that allows current to flow along an unintended path, often resulting in reduced functionality or damage.

Voltage Divider

A circuit configuration that divides the input voltage into smaller output voltages based on the ratio of resistances.

Fixed Resistors

Resistors with on ohmic value that cannot be changed.

Composition Carbon Resistor

Its resistance value is determined by the ratio of carbon to the binding material, which affects its conductivity. Resistance changes with age.

Metal Film Resistor

This resistor consists of a thin film of metal deposited on an insulating substrate. Resistance is determined by the type of metal used to form the film. Their resistance doesn’t change with age and their tolerance is better than that of carbon resistors.

Carbon Film Resistor

Made by coating a ceramic rod with a film of carbon instead of metal. Generally cheaper than metal film and higher tolerance than composition carbon resistors.

Metal Glaze Resistor

Fixed resistor similar to metal film resistor. Made by combining metal with glass.

Wire-Wound Resistor

Fixed resistor made by winding a piece is resistive wire around a ceramic core.

Resistance determined by material of resistive wire, diameter of wire, and length of wire.

Color Code

How the value of a resistor can be determined.

Variable Resistor

Resistor with values that can be changed or varied over a range.

Multiturn Variable Resistor

Operate by moving the wiper arm with a screw of some number of turns.

Rheostat

A variable resistor with 2 terminals.

Applications of Resistors:

Voltage Dividers and to limit flow of current.

Advantage of wire-wound resistors:

High power ratings

Gold Tolerance?

5%

Silver Tolerance?

10%