The solution of a typical series circuit problem requires the

application of Ohm's law and the series circuit formulas contained in

this lesson. The formulas used are determined by analyzing the

information given in the problem and the answers required.

Refer to the circuit above. When the current flowing through any

resistor is known or can be calculated, the total current is

determined by using the formula

It = IR1 = IR2 = IR3

It = IR2

It = 2 A

The total current in the circuit above may also be calculated by

using the Ohm's law formula

It = Et

Rt

= 100 volts

50 ohms

It = 2 A

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