# What's the difference between series an parallel components in the pictures

1. Feb 15, 2017

### snir

hi;
When I study - if we want to connect impedance in the case of: - we connect the R4 and (R1+(R2||R3)) as parallels

but when we want the get impedance of C and R of the right: - we connect that as series: Z(of C)+R .. why the different? please help!

2. Feb 15, 2017

### phinds

Because inductance and resistance are different things and you cannot combine them as exactly the same the way you can when everything is just resistances.

3. Feb 15, 2017

### Staff: Mentor

In the 2nd circuit, it's not clear what you are trying to solve for. In general, that circuit will not combine down to a simple component or two. Could you label the different components with different numbers (so each resistor has a different number, etc.), and ask what you would like to be able to solve for in the circuit?

4. Feb 15, 2017

### snir

I want to find a simple arranged of total impedance on the
different circuit 1 (all R) and 2 (with the C and L).

in case 1 told me that R4 and (R1+(R2||R3)) as parallels. and in case 2 impedance R1 and impedance C is series. but I think about it if I will connect something to the Terminals the connection of R1 and C is like a Δ transform with R2 no?

(may that matter what the purpose of tow cases - case 1 what the total R , and case 2 what the transfer function. If that matter i want to know why)

5. Feb 15, 2017

### Staff: Mentor

The impedance for circuit 2 looking into which 2 nodes? It makes a difference...

6. Feb 15, 2017