College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

For the circuit shown in Figure P18.20, calculate (a) the current in the 2.00-Ω resistor and (b) the potential difference between points a and b, ΔV= Vb− Va.


Figure P18.20


To determine
The current in 2.00Ω resistor.


Given Info:

Resistance R1 is 4.00Ω , Resistance R2 is 2.00Ω , Resistance R3 is 6.00Ω , Voltage ε1 is 12.0V , and Voltage ε2 is 8.00V .


Below Figure shows the direction of current in the circuit

  • ε1,ε2 is voltage in the circuits
  • R1,R2,R3 is corresponding resistance in the circuits
  • I1,I2,I3 is corresponding current in the circuits

Apply Kirchhoff’s voltage law to the left and right loop.

From the upper loop


Substitute, 4.00Ω for R1 , 2.00Ω for R2 , and 12.0V for ε1 in the above equation to find expression for I1


From the lower loop


Substitute, 2.00Ω for R2 , 6


To determine
The potential difference between point a and b.

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