4. Seven resistors are connected in series with a power supply. If another resis

Question

4. Seven resistors are connected in series with a power supply. If another resistor is added to the circuit in series:

_______ a) The current in each resistor will A) increase B) decrease C) remain the same

_______ b) The current through the power supply will
A) increase B) decrease C) remain the same


5. Seven resistors are connected in parallel to a power supply. If another resistor is added to the circuit in parallel:

_______ a) The current in each resistor will A) increase B) decrease C) remain the same

_______ b) The current through the power supply branch will
A) increase B) decrease C) remain the same


6. You have four 10 ? resistors. In the space below:

Explanation / Answer

4) a) decrease initially I = V/7*R after adding I = V/8*R b) decrease initially I = V/7*R finally I = V/7*R 5) a) remain the same initially current in each resistor = V/R (same voltage across all resistors) finally current in each resistor = V/R (same voltage across all resistors) b) increase initially current in supply = (V/R)*7 finally current in supply = (V/R)*8 6) a) 1 series , 3 parallel ==> resistance = R + R/3 = 13.3333333 b) 2series , 2 parallel ==> resistance = 2R + R/2 = 25 c) 4 series ==> r = 40 d)4 parallel ==> r = R/4 = 2.5 e)parallel 1 in branch-1 ; 3 series in branch-2 ==> r = (R*3R)/(R + 3R) = 7.5 f) series 2 in parallel branch-1 ; 2 in parallel branch-2 ==> r = (2R * 2R)/(2R + 2R) = 10 g)parallel-1, series -1 , parallel-2 ==> R*(R+R/2)/(R + (R+R/2)) = 6 h)series -1 , parallel 1 in branch-1,2 in branch-2 ==> R +( (R*2R)/(R+2R)) = 16.6666667

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