Why Do We Use 5v Or 12 Volts For The Electronic Devices ??

Replies

• 

  Anoop Kumar

  Is there any Tesla here😨, I am also looking for the answer☕
• 

  lovebox

  Its just a convention in digital electronics to represent logical high(1) by 5V and logical low(0) with 0V. This may have come in to practice because in the past most monolithic IC designs were based on Transistor Transistor Logic (TTL), which support 5V or 12V as their high values.
  Also, when we want to create digital circuits for low power, the use of low voltages a good option.
  The voltage difference between the logical high and the logical low states are also related to their noise reduction. Higher differences indicate less noise. So, while the logical low is maintained at 0V in all cases, the logical high can be set at 5V in a low noise environment and to 12V in a high noise environment.
  But if the digital circuit provides an equally good response with other values of voltages then they can also be used. Recent improvements in technology have allowed us to even use 0.7V to 0.9V for logical high and 0V to 0.1V for logical low.
• 

  Jeffrey Arulraj

  The transistors and diodes inside any IC is too small and they dissipate heat when voltage is applied due to power losses in the devices
  
  Smaller the size the lesser the energy required to destroy the device
  
  So we use lesser voltages to run these devices conventionally 5 V or 12 V
  
  PS: some Electronic devices run in as high as 6kV and 4000A rating as well
• 

  Rajasekhar Ramireddy

  Conqueror

  The transistors and diodes inside any IC is too small and they dissipate heat when voltage is applied due to power losses in the devices
  
  Smaller the size the lesser the energy required to destroy the device
  
  So we use lesser voltages to run these devices conventionally 5 V or 12 V
  
  PS: some Electronic devices run in as high as 6kV and 4000A rating as well

  i do understand that we should use low voltages for electronic devices...but what i dont understand is why only 5v..why not 4v or 6v ....there should be the reason behind this convention..becz simply we dont consider some random thing as convention ....is nt it??
• 

  Anand Tamariya

  5V is only design voltage. All semiconductors would typically have a range (e.g. 3-6V) which is considered ON state.
• 

  Jeffrey Arulraj

  A few regulators and IC555 multivibrators all use different voltage based on the need the required applied voltage differs
• 

  Anoop Kumar

  Why we won't use 48v battery or 120v dc?
  why limited to 12v, and upstanding to 240v while converting into AC!!
• 

  lal

  ianoop

  Why we won't use 48v battery or 120v dc?
  why limited to 12v, and upstanding to 240v while converting into AC!!

  What is the need of using that much volatge if that is not required to drive the device? The end result would be that the voltage will have to be reduced from such a high value to a usable limit which is as small as 3 volts or 5 volts in electronic devices.
  
  But, there are many devices like DC machines which need large voltage and power to function. An example is a DC motor. You might have seen 120V or 230V dc motors in the electrical lab of your college.
• 

  Anoop Kumar

  lal

  You might have seen 120V or 230V dc motors in the electrical lab of your college.

  Why our inverters use 12v battery only, it is most common?
• 

  Jeffrey Arulraj

  Charging a 12 V battery is easier than charging a 120 V battery
  
  As the required voltage to charge is about 13.4 V for 12 V battery and it is about 134V for a 120V battery
  
  This makes the charging of battery simpler in the case of lower voltage
  
  
  But you must know that mostly series of 12 V battery is used in an inverter
• 

  lal

  And again. A 120V lead-acid battery would have a lot of cells. To be exact 60 cells. That will make a 120V battery huge, very huge!!
• 

  Rajasekhar Ramireddy

  thank u every one..........
• 

  vamsi kancharla

  rajtheking46

  why are we using only 5volts or 12 volts as voltages for the electronic appliances???

  it is not manditory to use 5v/12v this voltage rating depends up on the appliance and their usage if we take lcd/led tv sets they also handle 12-20v at the end this is due to the using of diodes,and ics etc
• 

  vamsi kancharla

  if we consider a 12v battery is large when we take 120v battery its size will be big very large so 12v battery is recomonded to use