Electricity

EMF (electro-motive force)

The amount of chemical energy converted to electrical energy per coulomb of charge (C) when passing through a power supply.

Internal resistance

The resistance of the materials within the battery.

Superconductivity

When a material has zero resistance. Resistivity decreases with temperature. Very low temperatures are needed and the material becomes superconducting when below the critical temperature.

P.D.

Work done per unit charge between two points

Resistance

The opposition of a component to the flow of electric current through it.

As temperature in a thermistor increases…

resistance decreases.

A Superconductor

A material with no resistance below a critical temperature.

Kirchhoff’s current law

The total current entering a junction equals the total current leaving it.

Kirchhoff’s voltage law

The sum of all voltages around any closed loop in a circuit is equal to the total emf.

Power

The rate of energy transfer. Or the rate at which work is done.

Current

The rate of flow of charge in a circuit.

When light intensity increases on an LDR…

resistance decreases.