Resistors in dc circuits, Physics

Resistors in dc circuits:

Components are said to be in series when they are connected end-to-end providing only one path for the current.  Thus the same current passes through all the components (including the power supply).  See diagram below.

2204_resiatnce in dc circuit.png

When a current flows through a resistor (or a component having resistance) there is a potential difference between its ends.  Thus where two or more resistors are connected in series the potential difference between the extreme ends is the sum of the individual potential differences.

1105_resiatnce in dc circuit1.png

Hence E = V1 + V2 + V3

But from Ohm's Law V = IR

Therefore E  =  IRTOTAL

So     V1 = IR1             V2 = IR2             V3 = IR3

Thus IRTOTAL      =  IR1 + IR2 + IR3

                            =  I (R1 + R2 + R3)

So RTOTAL           =  R1 + R2 + R3


Posted Date: 9/13/2012 3:12:38 AM | Location : United States

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