Dot OR

American inventor who developed the first practical television system in 1930. He later improved upon his invention when he developed color television in 1955.

decibel (dB)

Engineering; Electronic engineering

A practical unit of relative gain. In terms of power, the relative gain in decibels is equal to: Gain (dB) = 10 log 10 ( P out /P in ), where P out is the output power and P ...

audio-frequency meter

Engineering; Electronic engineering

An instrument to measure frequencies in the audio-frequency spectrum (approximately 20 Hz to 20 kHz). Three types are commonly used: * Analog - Gives direct indications of ...

Boltzmann's principle

Engineering; Electronic engineering

A description of the statistical distribution of large numbers of tiny particles under the influence of a force, such as an electric or magnetic field. When the system is in ...

current-hogging injection logic (CHIL)

Engineering; Electronic engineering

A form of bipolar digital logic, similar to current hogging logic but having the greater density characteristic of injection logic.

current-limiting resistor

Engineering; Electronic engineering

A series resistor inserted into a circuit to limit the current to a prescribed value.

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Industry/Domain: Natural environment Category: Earthquake

2012 Indian Ocean earthquake

On 11 April 2012 an undersea earthquake struck near the Indonesian province of Aceh measuring at a magnitude of 8.6. There were initial fears that it ...