27. Resistors & DC Circuits

For the circuit below, calculate

(a) the voltage V₁ shown, and

(b) the current through the 6-Ohm resistor.

For the circuit below, calculate the voltage across the 100-Ohm resistor.

The circuit shown in Fig. E$25.30$ contains two batteries, each with an emf and an internal resistance, and two resistors. Find the potential difference $V_{ac}$ of point $a$ with respect to point $c$.

An emf source with ε = 120V, a resistor with R = 80.0Ω, and a capacitor with C = 4.00 μF are connected in series. As the capacitor charges, when the current in the resistor is 0.900 A, what is the magnitude of the charge on each plate of the capacitor?

In the circuit shown in Fig. E26.33 all meters are idealized and the batteries have no appreciable internal resistance. Find the reading of the voltmeter with the switch S open. Which point is at a higher potential: a or b?

In the circuit shown in Fig. E26.27 find the unknown emfs ${\epsilon }_1$ and ${\epsilon }_2$.