Chapter 3: Electricity Flashcards
Electric field
Region around a charged particle where any electric charge in the region
will experience an electric force
Electric field strength, E
Electric force acting on aunit positive charge placed at a point
Current, I
Rate of flow of charge, Q in a conductor
Potential difference, V
The work done, W in moving one coulomb of charge, Q from one point to
another
Ohm’s law
The electric current, I flowing through a conductor is directly
proportional to the potential difference across it if the temperature and
other physical conditions are constant
Ohmic conductors
Conductors that obey Ohm’s law
Resistance, R
Ratio of the potential difference across the conductor to the electric
current flowing through it
Resistivity of a
conductor, p
A measure of a conductor’s ability to oppose the flow of electric current
Superconductors
Materials that conduct electricity without any resistance
Critical temperature, T
The temperature when the resistivity of a superconductor becomes zero
Electromotive force
The energy transferred or work done by an electrical source to move one
coulomb of charge in a complete circuit
Internal resistance, r
The resistance caused by electrolyte in the dry cell
Electrical energy
The ability of the electric current to do work
Electric power
The rate of electrical energy dissipated or transferred
