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# 3. Circuits, Resistance, and Ohm’s Law

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Lecture

In this mini-lecture we explore circuits, which are closed loops of flowing current with a source of potential energy, often from a battery, that causes the charges to flow. As we move throughout this mini-lecture, we consider: (i) circuit diagrams; (ii) resistance (R), to the flow of charge as given in Ohm’s Law, I = V/R, where I is the current and V is the voltage of the battery; (iii) examples using Ohm’s Law; and (iv) the symbols for a battery, resistor, lamp, and switch used in circuit diagrams.

Course

In this course, Professor David Berman (Queen Mary University of London) explores charge, energy, and circuits at a GCSE level. In the first mini-lecture, we look at charges, the force a charge experiences in an electric field, potential energy, potential difference (or ‘voltage’), and energy (or ‘work done’). In the second mini-lecture, we introduce current as the flow of charge and define it mathematically before going through a couple of examples. The third mini-lecture delves into circuits, introducing the concept of circuit diagrams, resistance and resistors, and Ohm’s Law, followed by a few examples. In the fourth mini-lecture, we discuss properties of current, voltage, and resistance in circuits and introduce the series circuit, a circuit with only one path that the current can take. The fifth mini-lecture introduces parallel circuits as circuits in which the current can take more than one path through the circuit, and then goes through an example, concluding with the equation for resistors in parallel.

Lecturer

David Berman is a Professor of Theoretical Physics at Queen Mary. His research interests include string theory and ideas in fundamental theoretical physics, including non-commutative geometry, black holes physics, and quantum gravity. He has contributed to the Radio 4 biography series Great Lives and the In Our Time podcasts, including Great Lives: Richard Feynman (2018), Great Lives: Galileo (2019), In Our Time: Emmy Noether (2019), and In Our Time: Paul Dirac (2020).

#### Cite this Lecture

APA style

Berman, D. (2022, January 12). Introduction to Electricity and Circuits - Circuits, Resistance, and Ohm’s Law [Video]. MASSOLIT. https://massolit.io/courses/introduction-to-circuits/circuits-resistance-and-ohm-s-law

MLA style

Berman, David. "Introduction to Electricity and Circuits – Circuits, Resistance, and Ohm’s Law." MASSOLIT, uploaded by MASSOLIT, 12 Jan 2022, https://massolit.io/courses/introduction-to-circuits/circuits-resistance-and-ohm-s-law