P6: Static, Current Electricity and Circuits Flashcards
Tool to remember circuit calculations
- Draw 5 triangles in the order shown in the diagram
- place one unit symbol at each vertex of each triangle and between the vertices of adjacent triangles starting from the left and in an up-down pattern.
- The symbols to be selected are taken from the nemonic:
Can Julie Visit W***_atson _***A***_nd _***C***_arry _***S***_ome _***Jellybeans With A***_ssorted _***Raisins?
Each triangle represents a triangle formula

true or false: Neutral bodies have the same number of negative and positive charges
- true
true or false: in metals both electrons and protons can be mobile
false: the positive charges remain fixed
true or false: electron flow in the same direction of conventional current flow
false: the flow is opposite
true or false: all matter contains positive and negative charges
true
true or false: the positive and negative charges in a liquid can be mobile
true
define electrostatic induction
process by which electrical properties are transferred from one body to another without physical contact
in terms of electrostatics, what happens if a glass rod is rubbed with a piece of cloth
electrons transfer from the glass rod to the cloth resulting in a positively charged glass rod and negatively charged piece of cloth
in terms of electrostatics, what happens if a polythene(plastic) rod is rubbed with a piece of cloth
electrons transfer from the cloth to the polyethene rod resulting in a positively charged cloth and negatively charged of rod
true or false: an charged body can attract an uncharged one
true.
what subatomic particle is used to explain electrostatics
the electron
a charged polythene rod is brought near a small piece of uncharged paper and the paper sticks to the rod. Explain what may have happened
the polythene rode is negatively charged and the electrons on its surface repel the electrons on the surface of the paper, leaving a net positive charge which is now attracted to the negative charge on the rod
what are some useful applications of static charge
- lightening conductors to protect buidings
- use in electrostatic dust precipitators to reduce pollution of the environment from dust and carbon particles contained in smoke
- electrospraying of objects such a motorvehicles
- photocopiers
how is electric current carried in metals and graphite?
by electrons
how is electric current carried in a molten metallic compound?
ions
Electrical field from negative charge

what idealized model is used to study electric fields?
the positive test particle
Electrical field form positive charge

- what charge does this particle possess?
- where is the electric field strongest?

- its positively charged because the electric field goes outward from the particle
- the electric field is strongest nearest to the particle because the field lines are closest together near the particle
two charged plates A and B are placed near each other.
- what is the charge on plate A
- what is the charge on plate B
- plate A is positive
- plate B is negative
- what charge does this particle possess?
- where is the electric field strongest?

- its negatively charged because the electric field goes toward the particle
- the electric field is strongest nearest to the particle because the field lines are closest together near the particle
two particles A and B are in an electric field
- what is the charge of paricle A
- What is the charge of particle B
- where is the field strongest between the particles?
- Where is the weakest field between the two particles?

- charge on particle A is negative
- charge on particle B is positive
- electric field between them is strongest at C.
- the weakest electric field between them is at D
two charged particles A and B arein an electric field
- what is the charge of paricle A
- What is the charge of particle B
- Describe the electric field at C

- charge on particle A is negative
- charge on particle B is negative
- no electric field at C as the resultant electric force is 0
two charged particles A and B are in an electric field
- what is the charge of paricle A
- What is the charge of particle B
- Describe the electric field at C

- charge on particle A is positive
- charge on particle B is positive
- no electric field at C as the resultant electric force is 0
































