Practice Test 2

A simple model of skin impedance uses two resistors in parallel: dry pathway $R_d=100\ \text{k}\Omega$ and sweat pathway $R_s=25\ \text{k}\Omega$. A $5.0\ \text{V}$ measurement voltage is applied across both. Which statement about branch currents is true?

Two resistive heating elements in a temperature-controlled incubator are modeled as resistors in series: $R_1=20\ \Omega$ and $R_2=30\ \Omega$. A $10\ \text{V}$ supply is applied across the series pair. Based on Ohm’s Law, what is the current through the circuit?