[SOLVED] How a resistor limits the current???

[shantilal.s50]

Most of the teachers and trainers says that resistor limits the current but in case of 2 or 3 resistors connected in series( connected across a battery), the current remains same.??

Can anybody elaborate, please.

 

[betwixt]

The current in ANY DC series circuit is the same throughout. What goes in at one end is the same as what comes out at the other. The AMOUNT of current depends on the total resistance and the voltage across the ends but anywhere within the series chain will be carrying the same amount. In other words, if you broke the chain at any point and placed an current measuring meter across the break it would show the same reading.

Brian.

 

[sivamani]

When you have series of resistors the max current at across any resistor will be the current flow is ,which depends on max resistance of the resistor.

 

[betwixt]

post #3 - since when have we measured current ACROSS a resistor ???

Brian.

 

[keith1200rs]

It could be argued that resistors don't limit current at all. If you keep increasing the voltage across it, the current will keep increasing - ohms law. For a given voltage, a resistor can reduce the current.

Keith

 

[betwixt]

Yorkshire logic at work :lol:

Brian.

 

[deepmak]

greetings all
just a thought that probably "remains" is confusing Shantilal ; like the guys posted earlier , what the teachers are trying to say is something like " if we connect 2 or 3 resistors in series across a battery , the Same current will flow in each of them" and this current is determined by the voltage of the battery and the Sum of the resistors values. like Keith said , the current is according to Ohms law is : (battery voltage /total resistance in the series circuit )
regards

 

[keith1200rs]

Yorkshire logic at work :lol:

Brian.

Or ohms law! I guess the confusion comes from the fact that resistors are used, for example, to limit the current in an LED to the desired level. In that case the voltage(s) is fixed - the supply voltage less the LED voltage. They only really reduce current by dropping voltage across them.

Keith