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Electromagnetism

Electric fields, magnetic fields, circuits, Maxwell's equations, and the unified theory of electricity and magnetism that underpins all modern technology.

16 articles

Resistors in series and parallel circuit diagram showing R_total formulas

Electromagnetism

Jun 23, 202612 min read

How to Combine Resistors in Series and Parallel

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Power in Electrical Circuits: P = IV = I2R = V2/R Explained

Electromagnetism

Jun 21, 202611 min read

P = IV = I²R = V²/R — Power in Electrical Circuits Explained

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Resistance & Temperature: How Resistance Changes with Heat

Electromagnetism

Jun 19, 202611 min read

How Does Resistance Change With Temperature? R = R₀(1 + αΔT)

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Faraday's law — changing magnetic flux through a coil inducing an EMF

Electromagnetism

Jun 18, 202613 min read

Φ = BAcosθ and EMF = −dΦ/dt — Magnetic Flux and Faraday's Law

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Lenz's Law: The Direction of Induced Current Explained

Electromagnetism

Jun 17, 202611 min read

Lenz's Law — Why Induced Current Always Opposes the Change

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Kirchhoff's Laws: Solving Multi-Loop Circuits Step by Step

Electromagnetism

Jun 17, 202614 min read

How to Solve Multi-Loop Circuits With Kirchhoff's Laws

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Magnetic Field of a Current-Carrying Wire: B = mu0-I/2pi-r

Electromagnetism

Jun 16, 202612 min read

B = μ₀I/2πr — The Magnetic Field Around a Current-Carrying Wire

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Kirchhoff's laws — circuit diagram showing KCL at a node and KVL around a loop

Electromagnetism

Jun 13, 202616 min read

What Are Kirchhoff's Laws? KCL, KVL and Worked Examples

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Electric potential energy — two charges Q and q separated by distance r with E = kQq/r labeled

Electromagnetism

Jun 13, 202612 min read

Electric Potential Energy (E = kQq/r) — Work Done and Worked Examples

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Electric Current: I = Q/t, Drift Velocity & Ohm's Law Connection

Electromagnetism

Jun 13, 202611 min read

What Is Electric Current? I = Q/t, Drift Velocity Explained

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Capacitor with charge +Q and −Q on parallel plates, electric field E between them, and C = Q/V labeled

Electromagnetism

Jun 10, 202615 min read

What Is Capacitance? C = Q/V, Energy Storage and Worked Examples

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Ohm's law — circuit diagram showing voltage, current, and resistance relationship

Electromagnetism

May 1, 202613 min read

V = IR — Ohm's Law Explained With Circuits and Worked Examples

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Coulomb's law — two charged particles with attractive and repulsive force arrows

Electromagnetism

Apr 30, 202614 min read

F = kq₁q₂/r² — Electric Charge and Coulomb's Law Explained

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Magnetic field lines around a bar magnet with north and south poles labelled

Electromagnetism

Apr 14, 202615 min read

Magnetic Force on a Moving Charge — Formula and Right-Hand Rule

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Electric field lines radiating from a positive charge and converging on a negative charge

Electromagnetism

Apr 7, 202615 min read

Electric Field and Potential — Formulas and Worked Examples

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Electromagnetic induction — bar magnet moving into a coil inducing current in a circuit

Electromagnetism

Mar 25, 202615 min read

What Is Electromagnetic Induction? Faraday's Law and Lenz's Law

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