A series-parallel circuit may consist of series circuits connected in

parallel or it may consist of parallel circuits connected in series.

You have had the necessary laws and formulas needed to solve series-

parallel circuit problems. The important thing to remember is that

when working with resistances connected in series, use series-circuit

laws; and when working with resistances connected in parallel, use

parallel-circuit laws.

The following formulas are based on the laws of series circuits.

Total resistance equals the sum of the individual resistances.

Rt = R1 + R2 + R3 ....

Current flow is the same across

each resistance.

It = I1 = I2 = I3 ....

Total voltage equals the sum of the

voltage drops across each resistance.

Et = E1 + E2 + E3 ....

The following formulas are based on the laws of parallel

circuits.

Total resistance is determined by the reciprocal method.

1

=

1

+

1

+

1 ....

Rt

R1

R2

R3

Total current is equal to the

sum of the current of each

branch.

It = I1, + I2 + I3 ....

Total voltage is equal to the

voltage of each branch.

Et - E1 = E2 = E3 ....

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