Y1 Ch 13 Definitions

Question 1

Electric Current

Answer 1

The rate of flow of electric charge.

Question 2

Electrolyte

Answer 2

A conducting solution usually containing positive and negative salt ions dissolved in water.

Question 3

Potential Difference

Answer 3

The amount of electrical work one per unit charge flowing through a component.

Question 4

Electromotive force

Answer 4

The amount of electrical work done per unit charge by a power supply such as a cell in an electrical circuit.

Question 5

Resistance

Answer 5

The opposition to electric current.

Question 6

Superconductor

Answer 6

A material whose resistance drops to zero below a specific temperature called the critical temperature.

Question 7

Electrical Characteristic

Answer 7

A graph (usually I - V) that illustrates the electrical behaviour of the component

Question 8

Ohmic conductor

Answer 8

the current flowing through is proportional to the PD applied across it.

Question 9

non-ohmic

Answer 9

A component that does not obey Ohm’s law.

Question 10

Ohm’s law

Answer 10

Current is proportional to the potential difference

Question 11

Thermistor

Answer 11

A component whose resistance varies with temperature. (ntc) as temperature increases, resistance decreases.

Question 12

Intrinsic property

Answer 12

A property of a material itself, independent of other factors. e.g. resistivity

Question 13

Resistivity

Answer 13

The intrinsic resistance of the material that an object is made from.