11 points Se CP11 18 .001 My Notes Ask Your Teaher A bettery having an emf of 9.

Question

11 points Se CP11 18 .001 My Notes Ask Your Teaher A bettery having an emf of 9.21V deivers 101 mA when connected to a 67.0 loed. Determine the internal resistance of the battery Need Help? Pead h 2.44 points Se CP11 18 P.006 My Notos Ask Your Teacher Three 8.1 resistors are connected in series with a 23.0 V battery. Find the following. (a) the equivalent resistance of the circuit (b) the current in earl resistor (c) Repeat for the case in which al three resistors are connected in parelel across the battery current in each Need Help? Read '5 points Se CP11 18 P0OT. Consider the folkowing figure My Notes Ask Your Teachar 7.00 4.00 9.00 (a) Find the equvalent resistance between points a and b in the figure.(R = 20.0 ) (b) Calculate the current in each resistor if potential difference of 50.0 V is applied between points, and b. 1 (4.00 ) = (7.00 )- (20.0 = I (9.00D)- Need Help?

Explanation / Answer

1)

resistance = V/I

resistance = 9.21/0.101 = 91.19 ohm

internal resistance of battery = 91.19 - 67 = 24.19 ohm

2)

a)

equivalent resistance = 8.1 + 8.1 + 8.1 = 24.3 ohm

b)

current in each resistance = V/R = 23/24.3 = 0.946 amp

c)

now if resisters are in parallel so

equivalent resistance = 1/(1/8.1 + 1/8.1 + 1/8.1) = 2.7 ohm

current through battery = 23/2.7 = 8.52 amp

current through each resistance = 8.52/3 = 2.84 amp

3)

equivalent resistance = 4 + 7*20/(7+20) + 9 = 18.18 ohm

current through battery = 50/18.18 = 2.75 amp

current through 4 ohm and 9 ohm = 2.75 amp

current through 7 ohm = 20*2.75/(7+20) = 2.03 amp

current through 20 ohm = 0.72 amp

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