How to make a magnet

Actually electromagnet are temporary magnet.it is not a permanent magnet.it works when the elctricity pass through them.we can make a simple magnet.need things to magnet are 1.cell(using pencil cell or 9vcell or other) 2.metal(like iron etc)3.insulator wire or copper wire 4.one switch (optional)
Use a large wire connect the wire one side to the cell and the other end of wire wind the metal or coiling the metal.the remaing wire connect to the switch(not available connect to the cell directly)turn one cell wait few second the magnet ready to attract any metal object.increasing of the coil or wind yo the metal to increasing the attraction force

How to make a radio station

We can easy make radio circuit but we know about. How to simple radio broadcast station.simple broadcast station require components are capacitor,inductor,resistor etc.the inductor is signal send act as a tower and the capacitor is act as a sound booster and circuit current booster.we connect a mic to the circuit and speak when the circuit works the inductor send signals to the real FM station but the signal range is low at 30m radius.

Transformer

Transformer is electric device which boost electricity.when we will connect the input to transformer and high electricity than input electricity and reduce electricity than input mostly use stepdown transformer is used reduce electricity than input normally used in TV ,ampilifer etc

Speaker

Speaker is a device used in many electronic circuit.the speaker is produce sound that hear by our ears.speaker is used in TV,mobile etc.we connect the audio to the speaker and produce audio .how does it work.when the audio signal connected to the speaker.inside the speaker vibrating and produce sound why vibrating.inside the speaker has coil it is made up of copper.the coil transform to magnetic field when the audio signal gets the coil respond to the backside magnetic and vibration made and produce sound. The high volume connected to a speaker produce sound and distortion because the coil will heavy vibrating

Ic

The full form of IC is interfered circuit it consist about 100components make one IC is smaller and efficient.but IC is not repairable only replace

Multimeter

Multimeter is measuring device.it is used to measure electricity in PCB circuit and test electric component. Usually multimeter are in two types digital and analog.analog multimeter is low cost about rs400 to rs 2000.digital multimeter cost is rs300 to 39000

Diode

Diode is component that work to allow electricity that flows to forward direction and block backward or opposite types of diode are  
    
Backward diode
      It is normally used specialized application only like very high speed switching
   
Baritt diode

This is a time diode and mostly used in microwave application .

Gunn diode

This is mainly used to generate microwave rf signals making it is less expensive to produce signals .this diode not have a pn junction

Laser diode
 
      It is not a normal diode and produce coherent light . this diode are normally used in DVD and CD driver and used as laser light pointer. this diode uses milliwatts to conserve power. But the life of diode is limited

Light emitting diode

         This diode produce visible light and  cheaper price. It is normally used in DVD player cl,computer switch,TV  and light bulb. Light emitting diode are normally known as LED. The new type of LED is OLED is organic light emitting diode.

Photo diode
    This diode is normally used to detecting light. It is normally used to counting and light breaking circuit

Schoottky diode
It is used in rf application and clamming diode

 Step recovery diode
             This diode is used generating radio frequency (Normally calls rf )and pulses.this diode cutt of or turn off in seconds

Zener diode
   It is normally used to produce stable electricity means the electricity is not change

Inductor

Inductor
                Inductor number of characterises in many respects to those of the capacitor.inductor can boost the electricity in the magnetic field.unit of inductance is henry.mostly used as analog circuit and Signal processing
     Type of inductor are
              1.air core inductor
                       This type of inductor do not use magnetic core made by ferromagnetic material.this use other type of material like plastic,ceramic or nonmagnetic forms. inside the inductor do not touch free in air.this are often used high frequency.but this does not support widding in microphony
              2.radio frequency inductor
                    This normally using radio transmission.the wire is higher and high correct but low resistance
             3.ferromagnetic or ironcore
                       This type of inductor use ferromagnetic made of iron or ferrit to increase inductance but energy loses
               4.laminated core inductor
                         Low frequency made with this .this look like a transformer.steel plate or iron plate used to made the inductor and laminate to prevent from eddy current
                 5.toroidal core inductor
                          This inductor use same material magnetic material .looks like a circle or round ring.the one end of side apply electricity and gets the output in other side these are laminated
               6.choke
                  Choke are used block high power ac and allow low power ac.looks like a capacitor in two side in and out or donut
               7.variable inductor
                     This inductor normally used in radios to tune the station less than 100mhz and use non magnetic inductor to more than 100mhz

Transistor

                      Transistor is a component that works as a amplifiy signal and automatic switch.transistor amplifiy the signal connected to the input pin and gets output signal is greater than the input signal.transistor has three pins 1.base 2.emitter 3.collector

Capacitor

  capacitor is component that can store electricity temporary(like a temporary battery).inside the capacitor has two plate.one store positive voltage and second plate store negative. 

Basically capcitor is used as power conditioning,power factor corrector and used in amplifier to boost bass etc .in radios capacitor used to tune station,used couplier to block ac signals and allows DC signals,used in fans and motor to start the motor and operating in normal speed,signal processed in analogue circuit.1capacitor connected in 1.5v battery gets 500v

Conductor

Conductor is object that can allow electricity to pass them
                                   Eg:copper,silver etc

insulator

What is a insulator?

                      Insulator is object that do not allow electricity to pass them.eg:rubber plastic etc

resistor

What is the use of resistor?


                          Resistor is passive component that works to reduce the voltage.eg 9v battery connected to one terminal of resistor and the other terminal get 7.5v.
                                     
                                          Note:when the resistors ohm value change and output voltage
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