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There are several types of circuit breaker in general use in aircraft systems.

One is a magnetic type

There are two basic types of manual adjustors.

Rheostat Potentiometer

There are other types of fixed resistors in common use. included in this group are:

Carbon film metal film Metal oxide Metal glaze

When the end-to-center band marking system is used, either three or four bands will mark the resistor.

The 1st color band (nearest the end of the resistor) will indicated the first digit in the numerical resistance value. (Note: This band will never be gold or silver in color) The 2nd color band will always indicate the second digit of ohmic value. (Note: It will never be gold or silver in color) The 3rd color band indicates the number of zeros to be added to the two digits derived from the first and second bands, except in the following two cases: (A) if the 3rd band is gold in color, the first two digits must be multiplied by 10 percent. (B) If the 3rd band is silver in color, the first two digits must be multiplied by 1 percent. If there is a fourth color band, it is used as a multiplier for percentage of tolerance, as indicated in the color code chart. If there is no fourth band, the tolerance is understood to be 20 percent.

Examples of the more common wire type that technician will encounter in schematics.

The are the single wire, single shielded, shielded twisted pair or double and the shielded triple.

Unlike the thermistor, the resistance is controlled by light intensity.

This kind of component can be found in radio control heads where the intensity of the ambient light is sensed through the photoconductive cell resulting in the backlighting of the control heads to adjust to the cocking lighting conditions.

The percentage variation between the make value and the actual value of a resistor is known as the ________ of a resistor.

Tolerance

The term ___________ describes a situation in which some point in the circuit, where full system voltage is present, comes in direct contact with the ground or return side of the circuit.

direct short

A wire-wound resistor with tap is a special type of___________ that can be adjusted.

fixed resistor