The parts of an apparatus or appliance that produces unripe block up effect to electric current calls resistor, abbreviation resistor, it is component of a current limliting, can control the voltaic bulk on circuit spur track. Express with alphabetical R, international unit is ohmic (Ohm) , abbreviation Europe, the symbol is Ω , graphic symbol:

 

.

 

What the annulus that different color uses on resistor will express resistance is nominal block value, common resistor has resistor of 4 kinds of annulus and resistance of 5 kinds of annulus. Resistor of 4 kinds of annulus, it is carbolic film resistor commonly, with 3 lubricious annulus states block is worth, with lubricious annulus shows an error. 5 annulus resistor is metallic film resistor commonly, precision is taller, commonly used 4 lubricious annulus state block is worth, another lubricious annulus shows an error.

 

The color patch that uses different color will state resistor parameter calls way of lubricious annulus designation, lubricious annulus color represents different numerical value, following watches are shown:

 

Following plan institute show the lubricious annulus meaning of resistor of 5 kinds of annulus and reading regulation:

 

String together resistor receive the effect that has volume of electric current of limitative spur track in circuit, the resistor of 5 kinds of annulus with a for instance taller precision, color is palm, black, black, palm, palm respectively, nominal block is worth namely 100X10=1000 ohmic =1K.

 

 

Need not consider this resistor to be opposite respectively when analysing resistor circuit the circumstance of dc and alternating current, also need not consider the impact of frequency discretion, need to analyse this resistor block to be worth the size influence to voltaic size only, because resistor is right,the block that these telegraphic date place present is worth character same, resistor is below the typical action in circuit.

 

1, offer bias voltage for dynatron

 

The base of dynatron needs dc job voltage, can receive with a resistor right now between dc job voltage and this dynatron base, power source offers bias voltage to base through resistor R, the size of resistor R1 decided the size of bias voltage, this kind of resistor is called commonly in circuit slant buy resistor.

 

2, some a bit voltage in reducing circuit

 

 

When resistor is received between the A of power source and circuit, the tension that A hints is lower than power source voltage, can offer appropriate voltage for glow diode. Resistor R1 restricts the electric current of this spur track at the same time, protective glow diode won’t because too big and electric current is burned-out, this kind of resistor calls step-down resistor to perhaps be restricted commonly in circuit galvanic block.

 

3, circuit medium two elements circuit is kept apart

 

 

In circuit child circuit A and child segregation resistor is received between circuit B, can keep apart circuit of this two parts, wait for power source circuit and scanning normally in road of monochrome television Electromechanical circuit segregation uses structure of this kind of circuit, this kind of resistor calls segregation resistor commonly in circuit.

 

4, change electric current into voltage

 

 

When electric current has shed resistor, in resistor two end produce tension, if atlas electrode is laden,resistor R2 has this effect namely, the electric current that has shed resistor R2 changeover becomes voltage to be outputted from UO, this kind of resistor calls collector load resistor commonly in circuit.

 

5, cent controls function

 

 

When a voltage when U1 is too tall, can press circuit with composition of two resistor compose, reduce voltage to be U2, u2 accords with resistor cent to press formulary U2=U1*R2/(R1+R2) , this kind of resistor calls cent to approach resistance commonly in circuit.

 

6, billabong action

 

 

Should have flowed when an electric current of yuan of parts of an apparatus is too big, can use a resistor to it shunt-wound, have billabong effect, accord with voltaic billabong formula: I=I1+I2, this kind of resistor calls billabong resistor commonly in circuit.

 

7, current limliting protects action

 

 

Resistor R1 uses the electricity in restricting circuit, prevent rheostat block to be worth tone to arrive most hour, make voltage of dynatron VT1 base is equal to VCC of power source voltage, because VT1 base electric current is too big,meet in that way and attaint VT1, this kind of resistor calls protective resistor commonly in circuit.

 

8, the action that retreat Ou

 

 

In multistage amplifier circuit, r1 of the need in circuit of volts d.c. power supply and C1 such circuit that retreat Ou, he can prevent the harmful low frequency between multistage amplifier disturb, this kind of resistor calls the resistor that retreat Ou commonly in circuit.

 

9, disappear display vigour is used

 

 

Ask in a few function taller amplifier is medium, use such coupling circuit, establish ties in coupling loop namely R1 of a little resistance, can prevent the high frequency oscillation that circuit can appear, this kind of resistor calls pass the time in a leisurely way commonly in circuit brace up resistor.

 

10, damp action

 

 

Resistor R1 is received in LC syntonic circuit, can reduce Q cost, have damp effect, this kind of resistor calls damp resistor commonly in circuit.

 

11, RC circuit

 

 

The resistor in circuit and the circuit that capacitance combines together call RC circuitry, the R1 in the graph and C1 formed RC series circuit, r2 and C2 formed RC parallel circuits.

 

12, negative feedback effect

 

 

Resistor can make the negative feedback circuit of a variety of forms, the resistor R1 in circuit formed the feedback spur track of circuit of a kind of negative feedback, this kind of resistor calls feedback resistor commonly in circuit.