Need a help If the emf In the circuit shown Is 9 V, what Is the current In the 2

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If the emf In the circuit shown Is 9 V, what Is the current In the 20 ohm resistor? 0 14 A 0.65 A 130 A 270 A 0.30 A What is the equivalent resistance of the system of five resistors shown? 16 ohm 2.00 ohm 12.5 ohm 50 ohm 6.25 ohm A 6 V battery and a 12 V battery are connected to three resistors In a two loop circuit, as shown. What Is the current through the 6 ohm resistor? 0.33 A 2.0 A C. 2.33 A 0.25 A 0.75 A How much power is generated in the 6 ohm resistor if R = 4 ohm ? 278 W 411 W 16 W 40 W 24 W A 10 mu f capacitor is connected through a 2 ohm resistor and a switch to a 200 V emf as shown. The capacitor is initially uncharged. What Is the charge on the capacitor a long time after the switch S is closed? 20 zero 2.0 times 10-5C 400 C 100 C 200V 2.0 times 10-3C In an RC circuit, what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants? 0.84 0.90 0.75 0.60

Explanation / Answer

1) R eq = 20 +10 = 30 ohms

current = V/Req = 0.3A

3) V = I R

12 = 6I

i = 2 A

4) power = i^2 R

i = 20/10

power = 4*6= 24 W

5)

Q = CV

Q =200*10 u C = 2* 10^-3 C

6) Q = Q0 ( 1-e^-3)

energy is proportional to Q^2

E = 0.9E0

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