Electric Circuits, Elcetrodynamics, PEE

Ohm's law

The potential difference across a conductor is directly proportional to the current in the conductor at constant temperature.

Power (Electric circuits)

The rate at which work is done.

EMF

The maximum energy provided by a battery per unit charge passing through it.

Vrms

The AC potential difference which dissipates/produces the same amount of energy as an equivalent DC potential difference.

Irms

The alternating current which dissipates/produces the same amount of energy as an equivalent direct current.

Photoelectric effect

The process whereby electrons are ejected from a metal surface when light of suitable frequency is incident on that surface.

Threshold frequency

The minimum frequency of light needed to emit electrons from a certain metal surface.

Work function

The minimum energy that an electron in the metal needs to be emitted from the metal surface.

Atomic absorption spectrum

Formed when certain frequencies of electromagnetic radiation passing through a substance is absorbed.

Atomic emission spectrum

Formed when certain frequencies of electromagnetic radiation are emitted due to an atom’s electrons making a transition from a higher energy state to a lower energy state.