parallel circuit
If I have the resistance value of R1 and R3 but not the resistance value of R2 and the voltage is unknown how do I find RT and ET. The equation does show 2 amps across R2.

 

R2 = V2 / I2, I2 = 2 Amps.

 

parallel circuit
If I have the resistance value of R1 and R3 but not the resistance value of R2 and the voltage is unknown how do I find RT and ET. The equation does show 2 amps across R2.

We have no idea until you show a circuit diagram.
We do not put current across a resistor.
You can have voltage across a resistor and current flowing through a resistor.

 

We have no idea until you show a circuit diagram.
We do not put current across a resistor.
You can have voltage across a resistor and current flowing through a resistor.

 

What was the question?

 

View attachment 203667

What was the question?

How to find missing resistor value when voltage is also unknown. Missing resistor was R2 and voltage was unknown.

 

Use Ohm's Law.

I = V / R
V = I x R
R = V / I

You need two of the three values in order to determine the unknown value.