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Electricity and Magnetism

Electricity and Magnetism

Ohm’s Law

A resistor   The electricity moving through a wire or other conductor consists of its voltage (V), current (I) and resistance (R). Voltage is potential energy, current is the amount of electrons flowing through the wire, and resistance is the friction...

Electric Circuits

Simple circuits   When charged particles build up in an object it is called static electricity.  Another kind of electricity occurs when electrons flow in a current.  A battery and wires can make current flow. Look at the simple electric circuit...

Electric current

Electric current Electricity is produced when an electron moves after being taken away from an atom. Review that atoms make up all matter. Atoms are usually electrically balanced, there are as many positive charges (protons) as there are negative charges...

Coulomb’s Law and Electric Field

Charles-Augustin de Coulomb was a French physicist and inventor. He is known for his contributions in the fields of physics that study electricity and magnetism, and the author of a theory called the Coulomb’s law. Coulomb defined the electrostatic force...

Electric charge is conserved

Charging by friction, contact or induction. If you rub a balloon on your hair, electrons will be rubbed off your hair onto the balloon (charging by friction).            If you then place the negatively charged balloon near a neutral wall, the balloon...

Electrical phenomena in the atmosphere-lightning

Calculating Lightning Distances Watch the sky for a flash of lightning.Count the number of seconds until you hear thunder.Divide the number of seconds by 5 to calculate the distance the storm is away from your location in miles (or divide...

Kirchhoff’s rules

There are,  two circuit analysis rules that can be used to analyze any circuit, simple or complex. These rules are special cases of the laws of conservation of charge and conservation of energy. The rules are known as Kirchhoff’s...

Resistance in a Wire

Resistance The electrical resistance of an electrical element measures its opposition to the passage of an electric current; the inverse quantity is electrical conductance, measuring how easily electricity flows along a certain path. Electrical resistance shares some conceptual parallels with...

Capacitance – Capacitance of two parallel plates

Electrical Capacitance   You must have heard of the word capacity, for example the capacity of the stadium, or the capacity of the lungs. The word stadium capacity means: How many stadiums can visitors receive. so, by analogy, the word electrical...