Problem 4| Four resistors with resistance, R1=62, R2=4N, R3= 5N and R4=3N are arranged in the circuit to the right along with a battery with a potential difference of 12V. R, A. What is the equivalent resistance of the entire circuit? Voat B. What is the potential across and the current through resistor R1? C. What is the potential across and the current through resistor R4?

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A: Applying kirchoffs loop rule, 12-(10+20+10+10+10)*10^3 * I -24 =0   I=-12(60×103)=-2×10-4A=0.2mA

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.