Multi-loop circuits can look complicated because they contain several branches, resistors, batteries, and junctions where current can split or combine. Simple series and parallel rules are not always enough to determine every current and voltage in these circuits. That is where Kirchhoff’s laws become extremely useful. How to Solve Multi-Loop Circuits With Kirchhoff’s Laws starts…
Electric current I = Q/t: charge flowing per second, measured in amperes. Conventional current direction, drift velocity v_d = I/nAq, and worked examples.
Electrical power P = IV = I²R = V²/R in watts. Energy dissipated in resistors, efficiency, kilowatt-hours on electricity bills, and 4 worked examples.
Have you ever wondered how a device can store electrical energy and release it when needed? A capacitor is one of the key components that makes this possible. It can store electric charge and energy, then release that stored energy into a circuit when required. So, what is capacitance? Capacitance is the ability of a…
Why does a light bulb glow brighter when you increase the voltage? Why does a circuit draw more current when its resistance is reduced? These questions can be answered with one of the most important relationships in basic electricity: V = IR. Known as Ohm’s Law, the equation connects three fundamental electrical quantities: voltage, current,…
Electric charges can influence objects around them without physically touching them. A charged particle can push or pull another charge from a distance, and this interaction is described using two important concepts in electrostatics: electric field and electric potential. The electric field describes the force that a charge would experience at a particular location, while…
Magnetic flux Φ = BAcosθ and Faraday’s law EMF = −NdΦ/dt. Lenz’s law sign explained, electromagnetic induction, flux linkage, generators, and 4 worked examples.
Magnetic field around a long straight wire: B = μ₀I/2πr. Right-hand rule, force between parallel wires F/L = μ₀I₁I₂/2πd, solenoid B = μ₀nI, and 4 worked examples.
Electric Charge and Coulomb’s Law are fundamental concepts in electricity and magnetism. They help explain how charged objects interact with one another and why some charges attract while others repel. Everything around us is made of atoms, and atoms contain electrically charged particles. Protons carry positive charge, electrons carry negative charge, and neutrons have no…
