Concept- One has to be quite imaginative to tackle the electrical fault.Meter setting know how must be known very clearly. For example use of tongtester ammeter voltmeter, ally types of DVM must be known very clearly for starting fault diagnosis. Next knowledge of all available electrical equipment and spares which are in vogue is are also necessary.
Electrical Parameters- Knowledge of electrical parameter e.g. Resisitace, Inductance, Capacitance, Potential difference, Conductance, Current, is must be visualized and memorize. For your help I am explaining here for your reminding these at a glance
Current- Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms. The common symbol for current is the uppercase letter I. The standard unit is the ampere, symbolized by A. One ampere of current represents one coulomb of electrical charge (6.24 x 1018 charge carriers) .
Electric current can be either direct or alternating. Direct current (DC) flows in the same direction at all points in time, although the instantaneous magnitude of the current might vary. In an alternating current (AC), the flow of charge carriers reverses direction periodically.
Current per unit cross-sectional area is known as current density. It is expressed in amperes per square meter, amperes per square centimeter, or amperes per square millimeter.
An electric current always produces a magnetic field. The stronger the current, the more intense the magnetic field.
In locomotive DC current is the only concern but in large value.It is because traction current is always high.
Frequency-The number of complete AC cycles per second is the frequency, which is measured in hertz.
No comments:
Post a Comment