DIRECT CURRENT (DC) CALCULATIONS

SERIES DC CIRCUITS

Total resistance = the sum of the individual resistance’s

RT = R1 + R2 + R3 +....................

Total Voltage = the sum of the individual voltage drops

Ea = ER1 + ER2 + ER3 +.................

Total Current is determined by the Total Resistance (RT) of the circuit and Applied Voltage (Ea). It will be the same value at any point within the circuit.

It = IR! = IR2 = IR3 = ......................

Total Power = sum of all power losses in the circuit.

PT = PR1 + PR2 + PR3 + .................

PARALLEL DC CIRCUITS

Total Resistance = the reciprocal of the sum of the reciprocals.

For Multiple Branches:

For branches of like value:

Where RB = resistance of one branch, NB = # of branches

For Only Two Branches:

Total Voltage is applied to each branch of a parallel circuit

EA = EB1 = EB2 = EB3 = ...................

Total current = sum of the current in the individual branches.

It = It1 + It2 + It3 + ......................

Total Power = sum of all power losses in the circuit

Pt = PR1 + PR2 + PR3 +.................

DIVIDER NETWORKS

The division of voltage and current in a circuit can be determined in the following manner :

Voltage Divider Current Divider

BRIDGE CIRCUITS

The relationships that exist in a bridge are indicated below

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