OCR GCSE Physics A key terms

A point at which a circuit divides into branches or branches join together.

A unit of energy equal to the energy transferred by a 1 kW appliance operating for one hour.

Energy associated with an object's movement, measured in joules (J).

An energy store possessed by a moving object or moving part.

The energy store of a moving object.

A light-dependent resistor whose resistance falls as the light intensity falling on it rises.

The part of the current-carrying conductor within the magnetic field, represented by $L$ and measured in metres (m).

The rule that an induced current produces a magnetic field which opposes the change that caused the current.

A rigid bar that turns about a pivot and transmits a force from one position to another.

A light-dependent resistor whose resistance normally decreases as the light intensity increases.

An electronic device that records when an object interrupts a beam of light.

The point beyond which force and extension are no longer directly proportional.

A circuit element whose current is directly proportional to the potential difference across it, giving a straight-line graph through the origin.

A relationship represented by a straight line on a graph, with a constant gradient.

The force exerted normally per unit area by a liquid on a surface in contact with it.

The mains wire that supplies an alternating potential difference to an appliance.

Increasing the force applied to an object during a deformation test.

A wave in which the vibration is parallel to the direction the wave travels.

A device that converts a varying electrical signal into sound waves.

The use of a substance such as oil or grease between moving surfaces to reduce friction.

A material, object or device that produces a magnetic field and can exert magnetic forces.

The angle that Earth's magnetic field makes with the horizontal at a particular place.

A region in which a magnet, magnetic material or current-carrying conductor experiences a magnetic force.

The direction in which a north magnetic pole would experience a force; outside a magnet, it is from north to south.

An imaginary line used to represent the direction of a magnetic field; closer spacing represents a stronger field.

A measure of how strong the magnetic effect is at a particular point in a magnetic field.

A measure of the strength of a magnetic field, represented by $B$ and measured in tesla (T).