In the circuit shown in Fig. E26.27 find the current in the 3.00 Ω resistor.

Find the emfs ${\epsilon }_1$ and ${\epsilon }_2$ in the circuit of Fig. E26.26, and find the potential difference of point $b$ relative to point $a$.

(III) Determine the time constant for charging the capacitor in the circuit of Fig. 26–69. [Hint: Use Kirchhoff’s rules.] What is the maximum charge on the capacitor?

(I) Calculate the current in the circuit of Fig. 26–51, and show that the sum of all the voltage changes around the circuit is zero.

(III) When the resistor R in Fig. 26–72 is 45 Ω, the high-resistance voltmeter reads 9.7 V. When R is replaced by a 14.0-Ω resistor, the voltmeter reading drops to 8.1 V. What are the emf and internal resistance of the battery?

According to Kirchhoff's Loop Rule (Kirchhoff's Voltage Law), the algebraic sum of the potential differences (voltages) around any closed loop in a circuit is equal to what value?

In a circuit consisting of a $12V$ battery connected in series with a $4\Omega$ resistor and a $2\Omega$ resistor, what is the current through each resistor according to Kirchhoff's Loop Rule?