Gustav Robert Kirchhoff (1824-1887), German physicist, announced the laws which allow calculation of the currents, voltages, and resistances of electrical networks in 1845 when he was only twenty-one. In further studies he demonstrated that current flows through a conductor at the speed of light. His other work established the technique of spectrum analysis which he applied to determine the composition of the Sun.

1 Kirchhoff's Rules

2 Kirchhoff's Rules

3 Kirchhoff's Rules

4 Kirchhoff's Rules