Ch 27 Flashcards
1
Q
What is current?
A
Is the rate of flow of charge
I=Q/T
2
Q
What is the electron flow diriction
A
From the negative to the positive
3
Q
What is the conventional current?
A
It is an imaginary flow from positive to negative
4
Q
What is the law of current in a cylindrical shape?
A
n=NaP/A
n= number of mobile charges
Na=6.02*10 power 23
P=density
A=atomic mass
5
Q
What is another law of the current for a cylinder?
A
I=nqvd A
n=free charge density
A=cross sectional are
Vd= drift velocity
q= charge
6
Q
What is the low of electric current density?
A
J=I/A
J=nqvd
J= current density
7
Q
What is the resistance law?
A
R=pL/A
P= resistivity of a material
8
Q
Find the area of a copper wire if you are given the diameter
A
A=pi d square/4
9
Q
What is the power law?
A
P=v square/R
P=I square R
P= I V
