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Re: What happens if 12V bat is connect in parallel wif a 5V
Thks cydi. I just tried with 2 power supplies. One set to 5V and the other to 12V.
I short the both -ve terminals together. When I short both the +ve terminal, the resulting voltage is 12V. Its seems that the lower voltage will follow the higher voltage. Hmm.....I don't know the reason.
It pretty depends on the characteristics of the battery or power supply you are using.
In theory, If you are using 2 batteries, the result should be 12V if the power is infinite, this is because the lower voltage battery has an internal resistance, and behaves as a load rather than a power supply when connected to a higher voltage battery. You can find the numerial explanation studying the Thevenin equivalent circuit, for example here https://www.allaboutcircuits.com/vol_1/chpt_10/9.html
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Re: What happens if 12V bat is connect in parallel wif a 5V
when you connect two ideal voltage sources of 12V and 5V in parallel then assuming the internal resistance to be 'r' & taking r -> 0 & by solving by Thevenin's theorem we have the voltage coming out to be (12+5)/2=7.5V and the internal resistance is r/2 which is 0.
A:
Its not so much that doing so isn't allowed - its just that no good comes from doing so when the potentials don't match.
For equations:
1) try picking a wire size and length, or a trace size and length - calculate resistance therefrom
2) Using internal battery resitances and the conductor resistance, calculate current flow and the temperature rise per unit time - compare to heat dissapation rate
3) impress the interviewer with your ability to gage not only the time required for the copper to melt, but the ammount of light (if any) produced
4) further impress the interviewer by calculating battery temperatures after the wire pops - also calculate amp-hours remaining in each battery
Re: What happens if 12V bat is connect in parallel wif a 5V
1. the potential difference between two nodes will be same for all braches connected across .
2.any source should be considered as pure source in combination with source resistance.
3.current will flow from high potential to low potential
knowing those parameter , u can find the potential diff acoss the batteries by apllying kirchoff's laws.
Re: What happens if 12V bat is connect in parallel wif a 5V
When you connect 5V in parallel with the 12V battery, you are going to make Kirchoff very angry!!! In practice, there is some resistance between the batteries and a very large current equal to 7V/resistance will flow. Please don't try this at home!!! If the sources that you are using are current limited, then the systems will protect themselves from sourcing/sinking too much current.
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