-The current in the 8.00- resistor in the drawing in 0.500 A. (a) Find the curre

Question

-The current in the 8.00- resistor in the drawing in 0.500 A. (a) Find the current in the 20.0-, 12.0-, and both 9.0- resistors. (b) Find the voltage drop and indicate which point is at higher potential for following, between points G and F, A and B, A and E, and E and C.

-A brand new standard household 9-V battery has about the same potential energy as a 2200 lb car at the top of a 1200-ft-high hill. (a) How long will the circuit in problem 5 run if its voltage source is replaced with a 9-V battery? Assume the 9-V battery is ideal, e.g. zero internal resistance and constant voltage. Now, a 9 V golf cart battery contains about 1000 times more potential energy than a household 9-V battery. (b) How long would it run this circuit? (c) If the golf cart battery was driving this circuit, what would be the current in the 8.00-, 1.0-, and 20.0- resistors?

Explanation / Answer

Solving first question

Current across 8=0.5

Potential difference=8*0.5=4 volts

Current across 16 ohm =4/16=0.25 A

Current across 20 ohm =0.5+0.25=0.75 A

Potential difference between D and F=15+4=19 volts

Equivalent of 8,16 and 20=26 ohm

Equivalent of 9,18 is 6 ohm

Equivalent of 5,9,7 and 1=4.08 ohm

Equivalent of all except 12 ohm is R=2.22 ohm

Current across 12 ohm=19/2.22=8.55 A

Current across below 9 ohm=19/9=2.11 A

(b)

For potential

A is greater than B

G is equal as F

A is higher than E

C is higher than E as 20 ohm is much greater than combination of 7 and 1

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