Details of power source in circuits.

Now in this session details about power supply source, two type voltage source used in circuits one is the DC voltage source get it from battery another is AC voltage source from alternator they are independent power source.

DC VOLTAGE SOURCE

           DC voltage is constant voltage source voltage not varies w.r.t. time and flow of electrons is unidirectional. Main source of DC voltage is battery, DC generator mainly used for electronics devices. We can also get DC voltage by converting AC voltage through converter discusses later.

(A)                                           (B)   

                                   In image A the direction of current flow from higher potential positive to lower potential negative and image B the DC voltage source not varies w.r.t. time voltage source is constant throughout the circuit. If the value of V(S) = 10 Volt DC then the constant 10 volt (dc) throughout the circuit, DC voltage source mainly used as low voltage application.

CONCLUSION

·         DC is constant voltage source and flow of electrons is unidirectional.

·         It is used for low voltage application.

·         Cannot step (up/ down) and transmitted long distance due to more cost.

·         We can convert DC voltage in to AC voltage through inverter.

SYMBOL -DC Power source

AC VOLTAGE SOURCE

                      The AC voltage is main power supply source varies w.r.t time and flow of electrons bi-directional. We can also say AC voltage is variable power source. Such type power source get it from generator will be low and high voltage.

  

            In this image electrons first flow in (+V) positive direction after peak electrons flow in reverse and achieved (-V) peak in reverse direction means AC is a variable power source. We can generate the AC voltage through alternator Low voltage generation 220 or 440 volt and high voltage generation 11000 volt in power generating units. We can easily step up for transmission up to 440 k v through high voltage transmission line by using over head conductor discuss later.

CONCLUSION

·         AC is time varying power source and the flow of electrons in bi-directional.

·         It used high voltage transmission by using transmission line.

·         We can easily step (up/down) by using power transformers as desire.

·         AC voltage source use for high voltage application.

·         We can convert AC voltage into DC voltage using converter.

SYMBOL -AC Power source