Flashcards in 8.1-8.4 Charge and Current Quizlet Cards Deck (22)
What is a charge carrier?
A charged particle capable of transferring electric current.
What do we mean when we say charge is quantised?
It can only take certain values (always ne)
If n electrons are removed from a neutral object what is its charge?
What is an electrolyte?
A liquid containing charged ions.
What is a metallic conductor?
A material comprising a lattice of positive ions and delocalised electrons that carry electrical current
Which direction does conventional current flow?
From positive to negative.
Which direction do electrons flow in a circuit?
From negative to positive.
What is an ion?
A non-neutral atom or molecule.
What is a cation?
A positively charged ion
What is an anion?
A negatively charged ion.
What is an anode?
A positive electrode.
What is a cathode?
A negative electrode.
How is an ammeter connected?
What is the resistance of an ideal ammeter?
State Kirchoff's first law.
At any point in a circuit the sum of the currents entering that point is equal to sum of the currents leaving.
What is n in the equation I = nAve and what are its units?
Number density of free charge carriers m⁻³
What is A in the equation I = nAve?
Cross-sectional area of the conductor.
What is e in the equation I = nAve?
The elementary charge (1.6x10⁻¹⁹C)
What is v in the equation I = nAve?
The drift velocity of the charge carriers.
What is a conductor?
A material with a large number density of charge carriers ~10²⁸m⁻³
What is an insulator?
A material with a low number density of charge carriers.