Question

Three resistors of values 2 Ω, 6 Ω and 12 Ω are connected across a DC voltage source as shown in Figure 21-12. If the total current through the circuit is / 2.0 A, what is the current through the 12 Ω resistor? 

0.3 A  

0.1 A 

0.4 A 

0.2 A 

0.5 A

Answer 1

Solution:

equivalent resistance = Req

=> 1 / Req = 1/2 + 1/6 + 1/12

=> Req = 1.33 ohm

Using ohm's law,

=> V = I * R

=> V = 2 * 1.33 =

=> V = 2.67 V

Now again using ohm's law as the potential in parallel remains same

=> 2.67 = I * 12

=> I = 0.22 A

=> I = 0.2 A (approx)

thanks.