hello
How to make multiply v=ir current x resistance why not current + resistance how resistance do multiply give voltage current ampers x ohm what is ampers x ohms

 

Hello,

It is by Ohm's law:
https://en.wikipedia.org/wiki/Ohm's_law
Have a look at these formulas:

Bertus

 

hello
How voltage is come when current multiply resistance

 

Hello,

Have a look at this page from our partner site AAC:
https://www.allaboutcircuits.com/textbook/direct-current/chpt-2/voltage-current-resistance-relate/

Bertus

 

hello
How resistance control current 4.7k how it 4.7kohm is decided color is coded on it

 

Hello,

Have a look at the following pictures:




Bertus

 

Hello,

Also attached a PDF on how to select a resistor.

Bertus