A-Level Physics DEFINITIONS

Electric current is

the rate of flow of charge

Potential difference is

work done per unit charge

Superconductivity is

a property of certain materials which have zero resistivity at and below a critical temperature which depends on the material

Internal resistance is what

causes energy to be dissapated as current flows through the battery

Electromotive force is

the amount of energy provided by the battery to each coulomb of charge passing through

A potential divider is

used to supply constant or variable potential difference from a power supply

Motion in a circular path at constant speed implies there is

an acceleration and requires a centripetal force

Internal energy is

the sum of the randomly distributed kinetic energies and potential energies of the particles in a body

A force field is

a region in which a body experiences a non-contact force

Gravity is

a universal attractive force acting between all matter

Gravitational potential is

potential energy per unit mass

Electric field strength is

the force per unit charge

Capactiance is

charge over voltage

An inertial frame of reference is

one in which bodies move in straight lines at constant speeds unless acted upon by an external force, meaning Newton's laws of motion are valid