Chapter 8 Flashcards
Charge and Current (38 cards)
What is the SI units for electric current
Amperes(A)
What is electric current defined as?
Electric current is defined as the rate of flow of charge
What is the equation linking
- Current
- Charge
- Time
Q = I x t
What is the SI unit for charge
Coulombs
What is current derived from the equation Q = It
The amount of charge passing a given point in circuit per unit time
What is 1A equal to
1 C/s
What type of property is electric charge
A physical property
What are the 2 types of charges
1) Positive
2) Negative
What are ions described as when they referred by their charges
Relative charges
What is e
Elementary Charge
What is Elementary Charge
The relative charge a proton has e
(A electron has a charge of
-e)
What is the value of e
1.60 x 10^-19C
What is net charge
the charge on the object which is due to its gain or loss of electrons
How do you calculate the net charge on a object
Q = ne
Q-Coulombs
n-Number of electrons
e-Elementary charge
What is a charge carrier
carriers of charge(lol)
Name 2 charge carriers and where they operate
Electrons - Metals
Ions - Liquids
What is one way to make electrons to move in a metal wire
to make a positive end- this means all the electrons will flow towards to this direction
The greater the the rate of charge flow
the greater the electric current in a wire
What may a large current be due to?
1) A greater number of electrons moving past a given point each second
(e. g. a wire with a greater cross-sectional area)
2)A increase in the speed of the electrons moving faster through the metal
What is Conventional current
The direction of the electric current from the positive terminal to negative terminal
What is electron flow
The direction of the electric current from the negative terminal to the positive terminal
What is the name of the liquids that can carry current
Electrolyte
What are all the electrolyte
Molten ionic compounds
or
Ionic solution
What is the positive and negative electrodes called
1) Cathode(-)
2) Anode(+)
