From the figure above: 1) What is the current through resistor a when switch A a

ID: 2012282 • Letter: F

Question

From the figure above:

1) What is the current through resistor a when switch A and B have been open for a long time?

a) 0 A b) 5 A c) 9 A d) 10 A

2) What is the current through resistor g when switch A and B have been open for a long time?

a) 0 A b) 5 A c) 9 A d) 10 A

3) What is the power dissipated by resistor a when switch A and B have been open for a long time?

a) 20 W b) 100 W c) 200 W d) 450 W

4) What is the current through resistor a when switch A has been closed and switch B has been open for a long time?

a) 0 A b) 5 A c) 9 A d) 10 A

5) What is the current through resistor a when switch B has been closed and switch A has been open for a long time?

a) 0 A b) 5 A c) 9 A d) 10 A

1) Current must flow in a closed circuit only (4+2+12) =18

90 V/18 =5 A==>ans. b

2) same as above, must be a closed circuit 0A==>ans. a

3) 5 A squared times 4 =100 W==>ans. b

4) same as above, must be a closed circuit 90 V/18 =5 A==>ans. b

5) c in parallel to f+g==>(12*(4+2))/(12+4+2)+4 ==>a+b+4 =10

90 V/10 =9 A==>ans. c

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.