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

    Rajasekhar Ramireddy

    Member

    Updated: Oct 26, 2024
    Views: 1.3K
    why are we using only 5volts or 12 volts as voltages for the electronic appliances???
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Replies

  • Anoop Kumar

    Member • Jun 9, 2013

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

    Member • Jun 9, 2013

    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.
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  • Jeffrey Arulraj

    Member • Jun 9, 2013

    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
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  • Rajasekhar Ramireddy

    Member • Jun 11, 2013

    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??
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  • Anand Tamariya

    Member • Jun 11, 2013

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

    Member • Jun 12, 2013

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

    Member • Jun 12, 2013

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

    Member • Jun 12, 2013

    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.
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  • Anoop Kumar

    Member • Jun 12, 2013

    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?
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  • Jeffrey Arulraj

    Member • Jun 12, 2013

    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
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  • lal

    Member • Jun 12, 2013

    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!!
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  • Rajasekhar Ramireddy

    Member • Jun 13, 2013

    thank u every one..........
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  • vamsi kancharla

    Member • Jun 24, 2013

    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
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  • vamsi kancharla

    Member • Jun 24, 2013

    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
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