أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ٢_ t

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic Letter 2_ T


theory
théorie f

theory. A concept, or group of concepts, that aims to explain some aspects of the visible world and has not yet been proven or disproven. A theory (or “hypothesis”) can sometimes be called a model, description, or law if it holds up long enough.


thermal capacity(C)
Capacity and calorific value

Heat capacity. The energy involved in changing the temperature of an object by one degree and the unit is the joule in degrees Celsius or Kelvin. If the body has a mass m and is made of a material with a specific heat capacity, c is Cmc.


thermics
thermal f

Thermal studies of the effects of heat.


thermal effect
Effect m thermoionique

Thermoelectric effect. Cathode-ray tubes require a stream of electrons. A heated filament provides a cloud of electrons that can be attracted by a positively charged anode. The thermoelectric effect is the release of electrons from the heated filament.


thermistor
thermistor m

Thermal resistant. A device whose resistance decreases when the temperature increases, and therefore it decreases with increasing current. The element, which is a rod of some metal oxides, is used in electronic circuits and as a thermometer.

thermometer
thermometer m

Thermometer. A device used to measure temperature or heat.
It relates to the average energy of the sample particles, and it is impossible to measure this average directly. Therefore, all thermometers measure something based on temperature, such as: the length of a column of liquid in a tube (A) below, the pressure of a gas, the resistance of a section of wire, the voltage between two metals (B), or the color of a hot surface. In each case, the device is used at certain fixed points, and then it knows the degrees according to the approved scale.


thermostat
thermostat m

Thermostat. A device used to maintain the temperature somewhere within specified limits. Heat stabilizers appear in many household appliances, such as ovens, irons, and freezers.

Many thermal stabilizers use the bi-metal strip concept. This is the case in the gas oven shown below.


thirteen amp plug
Fish in treize ampères

13 amp plug. See three-pin plug.


three-pin plug
Fish in tripolaire

Three-head plug. The standard method for connecting a cable to a mains line outlet. Main cables have three wires: the “live” wire (brown clad) which carries current, the neutral (or “cold”) wire (blue clad) which carries returning current, and the “ground” wire (green or yellow clad) for safety. Each wire goes to One of the plug heads, as shown below.


thunder
tone f

thunder. See lightning.


thyristor
thyristor m

A p-n diode or transistor composed of four layers.
(See semiconductor).

The action of the binary depends on the correct structure and on the signals at the gate, if these exist. We often control the motors operated by the main supply lines and light attenuation adjusters using triacs.