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A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in series, the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.

Related Terms


The constant of proportionality in Newton's law of gravitation, equal to the gravitational force between any two particles times the square of the distance between them, divided by the product of their masses. Also known as constant of gravitation.


A constant of integration resulting from integration of Newton's second law of motion in the case of a conservative force; equal to the sum of the kinetic energy of the particle and the potential energy of the force acting on it.


  1. The temperature to which one junction of a thermocouple must be raised in order to make the thermoelectric electromotive force in the circuit equal to zero, when the other junction of the thermocouple is held at a constant low temperature. 2. The temperature at which the JouleThomson effect of a gas changes sign.


The product of an applied force and its time of application; used for quantitative determination of isometric work.


A unit of potential difference or electromotive force, equal to 1/1.01858 of the electromotive force of a Weston cell at 20 C; it has been superseded by the volt, and is equal to 1.00034 volts.


A derived unit of magnetic flux in the International System of Units; it is that magnetic flux which, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second.


An electric charge at the surface of contact of two different materials. contact electromotive force See contact potential difference. contact gear ratio See contact ratio.


A type of coupling circuit, with high pass frequency characteristics used in radar receivers to permit discrimination against received pulses of duration longer than the transmitted pulse. With the fast time constant (FTC) circuit in operation, only the leading edge of an echo having a long time duration is displayed on the radarscope. The use of this circuit tends to reduce saturation of the scope which could be caused by clutter. Also called ANTI-CLUTTER, RAIN, DIFFERENTIATOR


The interval of time required for the leading edge of a pulse to rise from 10 to 90 percent of the pulse amplitude.


The law that the direct current flowing in an electric circuit is directly proportional to the voltage applied to the circuit; it is valid for metallic circuits and many circuits component that obeys Ohm's law. OHV engine See overhead-valve engine.

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