State what Kirchhoff’s first law says.
Kirchhoff’s first law is associated with conservation of a particular quantity. State what this quantity is.
A variable resistor with resistance $R$ is included to regulate the current in the circuit, as shown in Fig. 5.1. The generator $G$ has e.m.f. $20\,\text{V}$ and internal resistance $0.50\,\Omega$. The battery has e.m.f. $12\,\text{V}$ and internal resistance $0.10\,\Omega$. The current in the circuit is $2.0\,\text{A}$.
Use Kirchhoff’s second law for the circuit to find $R$.
Calculate the total power output of $G$.
Calculate the power dissipated in the total resistance of the circuit.
The circuit transfers energy from the generator to the battery. Determine the efficiency of the circuit.
Calculate the power dissipated in the circuit’s total resistance.
Energy is supplied from the generator to the battery in this circuit. Determine the efficiency of the circuit.