A portion of a circuit is shown, with the values of the currents given for some

Question

A portion of a circuit is shown, with the values of the currents given for some branches. What is the direction and value of the current i? A. uparrow 5.5 A B. downarrow 5.5 A C. downarrow, 6.5 A D. uparrow A E. downarrow 2.5 A Two identical batteries, each with an emf of 18 V and an internal resistance of 1 ohm, are wired in parallel by connecting their positive terminals together and connecting their negative terminals together. The combination is then wired across a 4 ohm resistor. The current in each battery is: A. 1.0 A D. 3.6 A B. 2.0 A E. 7.2 A C. 4.0 A

Explanation / Answer

3) from kirchoff current law , At any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node

0 = 5 -2 +i +4 +2 -3 -3.5

i = -2.5 A

correct option is (E)

4) emf = 18 V , Ri = 1/2 = 0.5 ohms, R = 4ohms

I = emf/(R+Ri)

I = 18/(4+0.5)

I = 4 A

correct option is (C)

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