In the circuit of the previous problem, the switch S_1 is closed and the applied

Question

In the circuit of the previous problem, the switch S_1 is closed and the applied voltage E_s is held constants. How will the circuit current react as the resistance R_1 increases, and decreases? The current increases, and decreases The current increases, and increases The current decreases and decreases The current decreases and increases The current remains the same, and remains the same According to Ohm's law what formula should be used to calculate circuit current if voltage and resistance values are known? I = E R I = R F I = E/R I = R/E I = E^2/R The figure below represents experimental data for the current and voltage across a resistance. Using this data curve, determine the voltage when the current is 15 amperes. 15 V 50 V 75 V 100 V 150 V What is the current in a circuit with 15 ohms of resistance that uses 135 watts of power? 3 A 9 A 10 A 12 A 15 A

Explanation / Answer

14) V=IR => V is constant => I is inversely proportional to R

ie, when R increases I decreases and when R decreses I increase

15) I=E/R

16) R=5ohms and I=15A

voltage= I*R = 15*5=75V

17) Power P= I^2 *R => I = sqrt(P/R)

                  I= sqrt(135/15) = 3A

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