Problem:
Given
VT = 12V
R1 = 1kW
R2 = 2kW

Determine

IT
IR1
IR2

Procedure:

1. Find the total resistance

RT = R1 + R2
RT= 1k + 2k
 
RT = 3kW
 

2. Calculate the total current

IT = VT= 12 =  4mA
RT3k
 

3. Determine the current for each resistor

IR1 = IR2 = IT = 4mA

An important characteristic of series circuits is that the same amount of current flows through each element of  the circuit, including the source and all resistors.
Solution
IT = 4mA
IR1 = 4mA
IR2 = 4mA
 

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