enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Thermistor - Wikipedia

    en.wikipedia.org/wiki/Thermistor

    The effect can be used as a primitive latch/memory circuit, the effect being enhanced by using two PTC thermistors in series, with one thermistor cool, and the other thermistor hot. [ 19 ] The IEC standard symbol for a PTC thermistor includes a "+t°" under the rectangle.

  3. Electronic symbol - Wikipedia

    en.wikipedia.org/wiki/Electronic_symbol

    An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering ...

  4. Inrush current limiter - Wikipedia

    en.wikipedia.org/wiki/Inrush_current_limiter

    An NTC thermistor's resistance is low at high temperatures. When the circuit is closed, the thermistor's resistance limits the initial current. After some time, current flow heats the thermistor, and its resistance changes to a lower value, allowing current to flow uninterrupted. It is inherently impossible for 100% of supply voltage to appear ...

  5. Thermal conductance and resistance - Wikipedia

    en.wikipedia.org/wiki/Thermal_conductance_and...

    The transistor's manufacturer will specify parameters in the datasheet called the absolute thermal resistance from junction to case (symbol: ), and the maximum allowable temperature of the semiconductor junction (symbol: ). The specification for the design should include a maximum temperature at which the circuit should function correctly.

  6. Thermal cutoff - Wikipedia

    en.wikipedia.org/wiki/Thermal_cutoff

    Another type of thermal switch is a PTC (Positive Temperature Coefficient) thermistor; these thermistors have a "cutting off" temperature at which the resistance suddenly rises rapidly, limiting the current through the circuit. When used in conjunction with a thermistor relay, the PTC will switch off an electrical system at a desired temperature.

  7. Varistor - Wikipedia

    en.wikipedia.org/wiki/Varistor

    Modern varistor schematic symbol, which is the same as a thermistor symbol [1] A varistor (a.k.a. voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. [2] It has a nonlinear, non-ohmic current–voltage characteristic that is similar to that of a diode ...

  8. Dying To Be Free - The Huffington Post

    projects.huffingtonpost.com/dying-to-be-free...

    There's A Treatment For Heroin Addiction That Actually Works. Why Aren't We Using It?

  9. Self-regulating heater - Wikipedia

    en.wikipedia.org/wiki/Self-regulating_heater

    Since PTC heating elements are a kind of thermistor, they share the same principles of operation. The details depend on the type of material, but a class of materials widely used are crystalline ceramics. During manufacture, dopants are added to give the material semiconductor properties. These materials have somewhat negative temperature ...