Answer to Question #168463 in Electric Circuits for Macy

Question

DATA AND RESULTS:

Trials     No. of resistors      Ro      Io       Vo      Vc     voltage diff.

1            7

2            5

3            3

4            1 

Vc = IoRo       voltage diff. - IVc - VoI

QUESTIONS:

Refer to the table. Describe the values of the following in terms of increases, decreases, and constant.

     a. resistance _______________________

     b. ammeter reading ________________

     c. voltmeter reading _______________

Answer 1

the number of resistors in the trial. $n_1 = 7 \space\space n_2 = 5 \space\space n_3=3\space\space n_4 = 1$

1) in-series

a) $R_t = nR_0 \to n \downarrow \space\space R_t\downarrow$ resistance decreasing

b) ammeter reading is constant in the series

c) the voltmetr reading $U = IR_t \space\space R_t\downarrow \space\space U\downarrow$

1) parallel

a) $R_t = \frac{R_o}{n} \to n \downarrow \space\space R_t\uparrow$ resistance increasing

b) ammeter reading is $I = \frac{U}{R}$ $R_t \uparrow \space\space I \downarrow$ decreasing

c) the voltmeter reading constantly in the parallel