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# 4. The Electric Generator

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Lecture

In this mini-lecture, we discuss an application of magnetism, the electric generator, and go through a detailed example. In particular, we: (i) consider the diagram of an electric generator; (ii) write the magnetic flux at time t and time t + ∆t, where ∆t is a very small change in time, using trigonometric rules to simplify when needed; (iii) calculate the change in magnetic flux from time t to t + ∆t and use this result to determine the EMF of the electric generator; and (iv) plot the calculated EMF as a function of time, which gives a sinusoidal curve that corresponds to an alternating current like that which we receive in our homes.

Course

In this course, Professor Mohamed Anber (Durham University) explores magnetism. In the first mini-lecture, we discuss the magnetic fields of natural magnets and infinite wires carrying current. In the second mini-lecture we define the magnetic force and explore examples involving the magnetic force of one infinite wire on another. The third mini-lecture introduces magnetic flux in order to understand Faraday’s Law. In the fourth mini-lecture we turn towards an application of magnetism, the electric generator, and work through a calculation that gives us the electromotive force (EMF) of the electric generator. The fifth mini-lecture introduces a useful tool called the right hand rule that allows us to determine the direction of a magnetic field due to a wire carrying current, before introducing the principle of superposition and using these two new concepts in a variety of examples involving two infinite wires carrying current. The sixth and final mini-lecture goes over two demonstrations, the first involving natural magnets, and the second displaying Faraday’s Law.

Lecturer

Mohamed Anber is a Professor of Mathematical and Theoretical Particle Physics at Durham University. At the time of filming his course on magnetism, he was a Professor of Physics at Lewis & Clark College in Portland, Oregon in the United States. His research interests involve a broad range of theoretical physics topics, including those in quantum field theory and theoretical cosmology.

#### Cite this Lecture

APA style

Anber, M. (2022, January 12). Magnetism - The Electric Generator [Video]. MASSOLIT. https://massolit.io/courses/magnetism/the-electric-generator

MLA style

Anber, Mohamed. "Magnetism – The Electric Generator." MASSOLIT, uploaded by MASSOLIT, 12 Jan 2022, https://massolit.io/courses/magnetism/the-electric-generator