Other Free Encyclopedias » Science Encyclopedia » Science & Philosophy: Dysprosium to Electrophoresis - Electrophoretic Theory

Electric Circuit

current electrical circuits flow

An electric circuit is a system of conducting elements designed to control the path of electric current for a particular purpose. Circuits consist of sources of electric energy, like generators and batteries; elements that transform, dissipate, or store this energy, such as resistors, capacitors, and inductors; and connecting wires. Circuits often include a fuse or circuit breaker to prevent a power overload.

Devices that are connected to a circuit are connected to it in one of two ways: in series or in parallel. A series circuit forms a single pathway for the flow of current, while a parallel circuit forms separate paths or branches for the flow of current. Parallel circuits have an important advantage over series circuits. If a device connected to a series circuit malfunctions or is switched off, the circuit is broken, and other devices on the circuit cannot draw power. The separate pathways of a parallel circuit allows devices to operate independently of each other, maintaining the circuit even if one or more devices are switched off.

The first electric circuit was invented by Alessandro Volta in 1800. He discovered he could produce a steady flow of electricity using bowls of salt solution connected by metal strips. Later, he used alternating discs of copper, zinc, and cardboard that had been soaked in a salt solution to create his voltaic pile (an early battery). By attaching a wire running from the top to the bottom, he caused an electric current to flow through his circuit. The first practical use of the circuit was in electrolysis, which led to the discovery of several new chemical elements. Georg Ohm (1787-1854) discovered some conductors had more resistance than others, which affects their efficiency in a circuit. His famous law states that the voltage across a conductor divided by the current equals the resistance, measured in ohms. Resistance causes heat in an electrical circuit, which is often not wanted.

Electric Conductor - Conduction Of Electricity, Types Of Conductors, Resistance To Electrical Energy, Superconductors [next] [back] Electric Charge

User Comments

Your email address will be altered so spam harvesting bots can't read it easily.
Hide my email completely instead?

Cancel or

Vote down Vote up

over 2 years ago

Very helpful
Used. It 4 my science homework 
Thx for making life easier

Vote down Vote up

over 7 years ago

you guys are like no help at all.

Please for like everyones sake stop writing unhelpful and put actual help up

thanx =D

Vote down Vote up

over 5 years ago

i think butt is cool

Vote down Vote up

about 1 year ago


Vote down Vote up

over 2 years ago


Vote down Vote up

4 months ago

very helpful