Rt = 170 OHMS.
To solve for the current through any resistor in
in series, calculate the voltage across the
resistor, and then apply Ohm's law to determine
the current through the resistor.
The simplified diagram is used to determine the
voltage across each resistor. R3 and R4 are in
parallel, and the voltage across R4 is equal to
the voltage across R3. Since RB in the simplified
diagram represents the parallel combination of R3
and R4, the voltage across RB is equal to the
voltage across R3 and R4. Solving for the
Rt = RA + RB = 150
It = Et
It = 300 v = 2 a