**Series Circuits**

Total Resistance in Series Circuit {*Whether
they are Equal or Unequal*}

Total Resistance
of all Resistors on a Series Circuit =

R1 + R1 + R1 + R1 = Total resistance of that Series Circuit.

**Special
Notes:** The total resistance
will increase as you add more resistors to the series circuit.

**Special
Notes:** The total resistance of all resistors on
a series circuit will always be more than the amount of any one resistor
in the circuit, actually the total resistance will be the sum of all resistors
on that series circuit.

Total Resistance in Series Circuit

To find the total resistance of the above drawing with all resistors in a series =

3 ohms + 3 ohms + 3 ohms + 3 ohms = 12 ohms total resistance

**Parallel Circuits **

Total Resistance in Parallel [*Equal
Resisters*]

Number of resistors in parallel = Total Resistance

**Special
Notes:** The total resistance
will decrease as you add more resistors to the parallel circuit.

To find the total resistance of the above drawing with all equal resistors

resistance
= 10 ohm =2
ohm total

5 resistors

Total Resistance in parallel [*Maximum
of two Unequal Resisters*]

Resistance
of one resistor R1 x
R2 = Total Resistance

Number of resistors in parallel R1 + R2

To find the total resistance of the above drawing for two unequal resistors

= 3 x 12 = 36 =
2.4 Total ohms resistance

3 + 12 15

Total Resistance parallel circuit above
[*Minimum of Three or More Unequal Resisters*]

R1
x R2 = Y Y
x R3 =Resistance Total phase one of format

R1 + R2 Y + R3

3ohms x 12ohms = 36 = 2.4 Resistance

3ohms + 12ohms 15

Total phase 1 of format to find Y. You must carry “Y ”on to phase 2 of the format to calculate the third resister into the total Resistance Calculation.

Phase 2 = “Y”= 2.4

2.4 x 4ohm {the
third resistor} = 9.6 =
1.5 ohms Total resistance of circuit

2.4 + 4ohm {the third resistor} 6.4

**Special
Notes:** The total resistance of two or more resistors
on a parallel circuit will always be less than the amount of any one resistor
in the circuit.

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