imported_rajeshmarndi
Newbie level 2
i don't have a clear understanding of both volt and ampere rating on a product or a source
why ampere is also rated in a product or a source
for example a source 12v and capable of 500mA
and a product rated as 12v and 300mA
doesn't it mean the resistance of the product is r = v/i = 12v/300mA
so when connected to the source(12v) it will automatically draws i = v(source)/r(product) = 12v /(12v/300mA)= 300mA and wouldn't draw 500mA
so why ampere is rated in the product, only voltage would have done the purpose, in this case just a 12v source. As a 12v source would have provided 300mA.
OR why both voltage and ampere are rated only one would have solved the purpose
why ampere is also rated in a product or a source
for example a source 12v and capable of 500mA
and a product rated as 12v and 300mA
doesn't it mean the resistance of the product is r = v/i = 12v/300mA
so when connected to the source(12v) it will automatically draws i = v(source)/r(product) = 12v /(12v/300mA)= 300mA and wouldn't draw 500mA
so why ampere is rated in the product, only voltage would have done the purpose, in this case just a 12v source. As a 12v source would have provided 300mA.
OR why both voltage and ampere are rated only one would have solved the purpose