physics

Werner Jacobi

Werner Jacobi is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Werner Jacobi rather than just read about it. In short: Werner Jacobi (31 March 1904 – probably 3 May 1985) was a German physicist and inventor. Life and work Jacobi studied mechanical engineering at the Technical University of Munich and then physics at the Ludwig-Maximilians-Universität München.

Key takeaways

Werner Jacobi belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Werner Jacobi to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Werner Jacobi from memory before moving on to harder problems.

Reference excerpt

Werner Jacobi (31 March 1904 – probably 3 May 1985) was a German physicist and inventor.

Life and work Jacobi studied mechanical engineering at the Technical University of Munich and then physics at the Ludwig-Maximilians-Universität München. In his dissertation, initially supervised by Wilhelm Wien and after Wien's death by Eduard Rüchardt, he dealt with the charges of the mercury atoms in the canal jet (German: Ladungen der Quecksilberatome im Kanalstrahl). With this work he was awarded a Doctorate of Philosophy. On 4 November 1929, Jacobi joined Siemens & Halske AG. He worked at the Siemens tube factory in Berlin, where he became head of the laboratory in 1934 and quickly rose further, becoming chief engineer in 1937 and authorized representative in 1938. Shortly after his appointment to the authorized signatory in 1941, he was transferred to the Wernerwerk für Funktechnik in Vienna, where he became department director in 1944. In 1949, he briefly worked in the Wernerwerk für Radiotechnik, then went to the Wernerwerk in Erlangen. One of the most important of his more than 100 inventions, the "semiconductor amplifier", which he registered for a patent on April 15, 1949, was invented during this period. This circuit, consisting of five transistors on a semiconductor serving as a carrier material, may be the first integrated circuit designated. However, it remained largely unknown and was not used commercially. From 1946 to 1956, Jacobi played a key role in setting up the Siemens tube factories and then became the overall manager of the tube works. After he was appointed general representative in 1962, he retired in 1969. Up until his 68th birthday, he was available to the management of the building elements division for questions, then he left the company entirely. The Technical University of Vienna awarded him the title of honorary doctorate of the technical sciences “in recognition of his special achievements as a scientist and inventor in the field of electronic components and of electronic circuit technology." The British electronics engineer Geoffrey Dummer is also often referred to as the inventor of the IC, although he only published his work three years after the Siemens patent application was filed.

Sources Werner Jacobis personnel index card in the Siemens archive Beitrag zur Verleihung der Ehrendoktorwürde. In: Informationen der Technischen Hochschule Wien. Jahrgang 3, 1972, Heft 2, S. 27 (mit Porträtfoto).

References

Worked examples

Example 1 — a first encounter with Werner Jacobi

Start with the simplest possible case. Write down what Werner Jacobi claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Werner Jacobi before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Werner Jacobi ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Werner Jacobi

In research: Werner Jacobi appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Werner Jacobi in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Werner Jacobi is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1904 births, 1985 deaths, 20th-century German inventors, so understanding it makes those chapters shorter.
In everyday life: Look for Werner Jacobi outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Werner Jacobi” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Werner Jacobi in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Werner Jacobi means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Werner Jacobi out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Werner Jacobi in simple terms?

Werner Jacobi (31 March 1904 – probably 3 May 1985) was a German physicist and inventor. Life and work Jacobi studied mechanical engineering at the Technical University of Munich and then physics at the Ludwig-Maximilians-Universität München.

Why does Werner Jacobi matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Werner Jacobi?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Werner Jacobi.