Inductor and inductance

Inductor is the form of electromagnetic field temporary storage of electromagnetic energy electronic devices. Inductor is a group of coil, some inductor coils can increase its inductance is the amount of iron core, have a strong magnetic iron core, the cylindrical by adjusting the iron core can increase the inductance quantity or reduce inductance quantity.

Inductor have against current tendency. As for dc, inductor is no side effect, but for alternating current speaking, inductors have a exchange impedance, called inductance. The inductance and inductance quantity and the frequency of the alternating current relevant, use the equation is expressed as XL = 2 fLL, its unit for PI ohms. Inductor can be used to filter.

In the electrical nature, inductors and capacitor is the reverse. With the inductance Henry said. There are two main types of inductance coil, hollow coil and iron core coil.

Component test

Once a component fault, the doubt will have to do some tests. The ideal way is to put the components in the line from complete it out. But if not convenient (or at least at discriminant need to remove), should disconnect before a root or a few root lead, should avoid during the test between adjacent components current pathways. This passage will have no real data, lead to draw the wrong conclusion. The method of testing components summed up as follows.

A resistor usually use ohm table to test (mostly is a resistance ranges multimeter). With his power, multimeter if not completely from the resistors and take down the road (i.e. the disconnect end), is the test circuit with its own power supply must be off. Ohm table pointer full scale deflection usually said zero resistance. The meter, pens and touch together, first with the regulator to the electric meter ohm table for zero.

The resistance of the capacitor can also use ohm table inspection. The electric meter readings, this just is very low. As capacitor role and charging, pointer to the high impedance terminal gradually move. Pointer to stop turns reading is the insulation resistance, hypothesis capacitor resistors no trouble, insulation resistance value is usually high. Low resistance, said capacitor short circuit or leakage. If the electric meter a pick