# Moritz von Jacobi

(Redirected from Moritz Hermann von Jacobi)
Moritz Hermann von Jacobi
Moritz Hermann von Jacobi
Born 21 September 1801
Potsdam, Kingdom of Prussia
Died 10 March 1874 (aged 72)
Saint Petersburg, Russian Empire
Residence Prussia, Russian Empire
Nationality German
Fields Physics, Engineering
Known for Maximum power theorem

Moritz Hermann (Boris Semyonovich) von Jacobi (Russian: Борис Семёнович (Морис-Герман) Якоби) (21 September 1801 – 10 March 1874) was a German Jewish[citation needed] and Russian engineer and physicist born in Potsdam. Jacobi worked mainly in Russia. He furthered progress in galvanoplastics, electric motors, and wire telegraphy.

## Motors

In 1834 he began to study magnetic motors. In 1835 moved to Dorpat (now Tartu, Estonia) to lecture at Dorpat University. He moved to Saint Petersburg in 1837 to research usage of electromagnetic forces for moving machines for Russian Academy of Sciences. He investigated the power of an electromagnet in motors and generators. While studying the transfer of power from a battery to an electric motor, he deduced the maximum power theorem. Jacobi tested motors output by determining the amount of zinc consumed by the battery. With financial assistance of Czar Nicholas, Jacobi constructed in 1839 a 28-foot electric motor boat powered by battery cells. The boat carried 14 passengers on Neva river against the current. The boat fared at the speed of three miles for hour.

## Jacobi's Law

Circuit Diagram

Power is being transferred from the source,
with voltage V and resistance RS,
to a load with resistance RL,
resulting in a current I. I is simply
the source voltage divided by the total

circuit resistance

The law known as the maximum power theorem states:

"Maximum power is transferred when the internal resistance of the source equals the resistance of the load, when the external resistance can be varied, and the internal resistance is constant."

The transfer of maximum power from a source with a fixed internal resistance to a load, the resistance of the load must be the same as that of the source. This law is of use when driving a load such as an electric motor from a battery. Jacobi obtained his theorem by applying common sense[citation needed].

## Electrotyping and telegraphy

In 1838, he discovered galvanoplastics, or electrotyping, a method of making printing plates by electroplating. The way in which this works is analogous to a battery acting in reverse. The stereotype was an impression taken from a form of movable lead type and used for printing instead of the original type. This technique is used in relief printing.

He also worked on the development of the electric telegraph. In 1842-1845 he built a telegraph line between Saint Petersburg and Tsarskoe Selo using an underground cable. In 1867 he was a Russian delegate to the Commission on measurement units at the Paris World's Fair. He was a strong proponent of the metric system.

## Family

He was a brother of the mathematician Carl Gustav Jacob Jacobi.[1]

## Notes

1. ^  Gilman, D. C.; Peck, H. T.; Colby, F. M., eds. (1905). "Jacobi, Moritz Hermann". New International Encyclopedia (1st ed.). New York: Dodd, Mead.