Electricity and Magnetism Flashcards
Law of Electric Charges
States that like charges repel and opposite charges attract.
Electrons
Subatomic particles which orbit the nucleus of an atom and are negatively charged. Electrons are found outside the nucleus.
Electric Force
The force between charged objects.
Two factors determining the strength of electrical force are?
1: size of the charges
2: distance between charges
Conductor
materials in which charges can move easily
Insulator
materials in which charges cannot move easily
Static electricity
The build up of electric charges on an object. ( An object charges by friction because of the rubbing of two objects together can cause electrons to be whipped from one object and transferred to another)
Electric discharge
The loss of static electricity as charges move off an object
Electric discharge example
Walking on carpet with your fuzzy socks on, negatively charge builds up on your body. touching a metal door knob.
Cell
A device that produces an electrical current by converting chemical energy into electric energy.
Battery
A device made up of several cells.
Current
The rate at which charge passes through a given point.
Current SI unit?
Amps
Resistance
The opposition to the flow of electric charge.
Electrical power
the rate at which electrical energy is used to do work.
Circut
a complete closed path through which electric charges flow.
Voltage
the amount of energy released as a charge moves between 2 points in the path of a current
What is the SI unit of power?
Watts
Magnet
any material that attracts iron or materials containing iron
magnetic poles
part of a magnet where the magnetic effects are the strongest
magnetic field
exist in the region around a magnet in which magnetic forces can act
Electromagnetism
interaction between electricity and magnetism
Electromagnet
a magnet that consists of a coil of wire wrapped around an iron core
Electric motor
a device that changes electrical energy into KE
Ohms law
V=IR
Resistance formula
R=V/I
Current Formula
I=V/R
