Electricity, Electric Charges And Curren Flashcards
What is an atom made out of?
Protons (+)
Neutrons (No charge)
Electrons (-)
What is the condition for electric current to pass round a circuit?
The circuit must be complete (closed)
There must be a source of potential difference I.e battery
What is electric current?
Current The rate of flow of charge in a wire or component.
Electric current is the movement of negative charges in a circuit.
What is a charge carrier?
Charged particles that create current due to its passage are called charge carriers
What is the convention for the direction of current in a circuit?
From positive to negative
What is the symbol for electric charge?
Q
What are electrons?
Electrons are charge carriers that flow in an electric circuit - from negative to positive terminals
What is the charge on a proton?
1.6 x 10 ^-19C
What is the equation for electric charge and what is it measured in?
Q = It
Where Q charge in Couloumbs C
Where I current in Amperes A
And t time takes in seconds s
What does the conservation of charge state?
No net electric charge can be created or destroyed
What is Electricity
Move,ent of charge around a circuit, also referred to as electric current.
What is the unit of current?
The unit is Ampere (A) which is defined in terms of magnetic force between two parallel wires when they carry the same current. The symbol for current is I
What is the equation for current?
I = change in Q/ Change in t
What are the three ways materials can be classified in electrical terms?
Conductors, Insulators or semiconductors
Describe what happens in an insulator.
In an insulator, each electron is attached to an atom and cannot move away from the atom. When a voltage is applied across an insulator, no current passes through the insulator, because no electrons can move through the insulator.