Electricity & magnetism Flashcards
Charging by induction
Charging an object by the influence of another charged object without touching
Electric field [2]
definition and how it is represented
1) Region around a charged particle or object within which a force would be exerted on other charged particles or objects
2) The effects of an electric field can be represented by electric feild lines: Lines cannot cross over each other
Lines always point from positive charges
Electric current is… [2]
include formula
1) Rate of flow of charges
2) I =Q/t
t= time
Q= Charge
I = current
What happens when electric feild is applied to conductors
Electrons will flow producing electric current
Coulomb
1/1.6x10^-19=6.24x10^18
What happens when you bring a magnetic material to south or north pole? [2]
1) Attract
2) Attract
State 4 magnetic materials
1) IRon
2) Nickel
3) Cobalt
4) Steel
Define magnetic feild
A region which a magnetic pole experiences a force
Define uniform magnetic feild
A magnetic field that has the same strength and direction at all points
define Conventional current [2]
1) Flow of positive charge
2) Opposite of actual flow of electron
Conventional current fomurla
I= Q/t
Current = Energy / seconds
Define electrical circuit [2]
1( For electrical current to flow there must be a continous path
2) We call this an electrical circuit
Series circuit
Current has one single path, current is the same at all points
Parallel circuit
Current is split across the parallell branch
has a line in the circuit
Ammeter
Measures flow rate so measure electrons
Conventional current always flow from positive terminal to negative terminal of the battery T or F
True
define emf (Electromotive force)
The battery provides emf to push the electrons along the circuit
Energy transfer in a circuit [2]
1) The chemical potneital energy in a battery is transformed into electrical energy
2) Eletrical energy is carried by moving electrons along the wire from points of high to low electrical poential energy
Voltage formula
E / Q
E= Difference in electrical p.e per coulomb of charge
Electric field define
Where charge experience a force
