The relation between length and resistivity is given by the resistivity formula, i.e, ⍴ = R/L. Resistance varies directly with the length of the wire. It means that any variation in the length of the material will change the value of resistance (or resistivity).

A high-resistance connection (HRC) is a hazard that results from loose or poor connections in traditional electrical accessories and switchgear which can cause heat to develop, capable of starting a fire. Glowing connections occur when relatively high current exists in a relatively large resistance object.

Spiral Heating caused by broken or snipped conductors (above). Resistance, opposition to current flow in a circuit. Connection anomalies pose resistance problems in our motor circuits and if they are not identified and corrected, they can have deleterious effects.

The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.

Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature. With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.

Resistivity is indirectly proportional to the temperature. In other words, as you increase the temperature of materials, their resistivities will decrease.

Answer. the metaliods silicon germanium and semiconductors..and blah blah..are elements resistance decreases on increases temp….

A temperature coefficient describes the relative change of a physical property that is associated with a given change in temperature.

The resistance is directly proportional to the temperature. ii) The resistance of an alloy remains nearly unaffected by the change in temperature. In alloys, like constantan, atoms are in disorder so alloys have big resistivity. Their additional disorder due to temperature increase is insignificant.

Answer: When a pure semiconductor is heated, its resistance decreases. When the temperature is raised, some covalent bonds in the semiconductor break due to the thermal energy supplied.

Complete Step by step solution When a material is heated the valence band and conduction band moves due to the energy from the heat. In the case of conductors, the valence band and conduction band overlap and resistance increase.

Increasing the temperature of intrinsic semiconductors provides more thermal energy for electrons to absorb, and thus will increase the number of conduction electrons. Voila – decreased resistance.

Semiconductors have negative temperature coefficient of resistance. It means that when the temperature of semiconductor increases, its resistance decreases and vice versa. Here, as the temperature of semiconductor is cooled from T1k to T2k, the resistance of the semiconductor will increase.

Silicon has large band gap (1.12eV) than germanium (0.7eV). So, at same temperature, the thermal pair generation in silicon is less than germanium. Ge has higher electron and hole mobility and because of this Ge devices can function up to a higher frequency than Si devices.

A semiconductor that has been doped with donor atoms resulting in a N-type extrinsic semiconductor in which electron concentration in much more than the hole concentration and conduction is due to the electrons which are the majority carriers while holes are minority carriers.

The most commonly used semiconductor is

• Silicon has much smaller leakage current than that of germanium.
• Silicon can be worked at a higher temperature as compared to germanium.

The most used semiconductor materials are silicon, germanium, and gallium arsenide.