With the switch open, the circuit flow in the circuit is A. 0 A B. 6 A C. 4 A D.

Question

With the switch open, the circuit flow in the circuit is A. 0 A B. 6 A C. 4 A D. 3 A E. 2 A When the switch closes, the battery current A. Increases. B. Slays the same. Refer to the circuit lo the right below What is the equivalent resistance in the circuit? A. 15 Ohm B. 12.7 Ohm C. 5.23 Ohm D. 4.28 Ohm E. none of these What is the current through 4.0 Ohm resistor? A. 120 A B. 0.90 A C. 0.72 A D. 2.80 A E. none of these Which of the following equations is Kirchoff's loop rule applied to the right loop circuit counterclockwise? A 12V + I_1 (4 Ohm) + _3 (2 Ohm) = 0 B. 15 V - I_1 (4 Ohm) - I_3 (2 Ohm) = 0 C. 12 V + -2 (4 Ohm) + _3 (4 Ohm) + 15 V = 0 D. -15 V + I_2 (2 Ohm) = 0 E. none of these.

Explanation / Answer

11.

if V=6 V

with switch open ,the current in the circuit is

I=V/R1=12/2 =6 A

12.

Answer is current a) increases

with switch closed ,equivalent resistance is

Req=(1/2 +1/2)-1=1 ohms

the current is

I=12/1 =12 A

13.

equivalent resistance

R=2+1+(1/3+1/4+1/5)-1

R=4.28 ohms

14.

total current

I=12/4.28=2.8 A

voltage across 3 ,4 and 5 ohms is

V1=(1/3+1/4+1/5)-1*2.8=3.58 Volts

current through 4 ohms is

I4=3.58/4=0.9 A

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