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Definition: Photoresistor is a type of device whose resistance changes with respect to the intensity of the incident radiation. It has a tremendous ability to change its resistance in exposure to light. LDR is an acronym for Light Dependent Resistor. It is a non-linear device. The photoresistor is also termed as the light dependent resistor or photoconductor as it displays the property of Definition: TRIAC is basically a 3 terminal ac switch that shows conduction in both the directions. These are triggered into conduction by low energy gate signal. TRIAC is a contraction of TRIode for Alternating Current. It is a bidirectional device that belongs to the thyristor family and is basically a diac with gate terminal used to control the turn-on conditions of the device. Let us have a look at Definition: VCO is an acronym for Voltage Controlled Oscillator. It is a device that produces such an oscillating output signal whose frequency can be regulated or altered by the input dc voltage. In other words, we can say, VCO generates an output signal having an adjustable frequency range that is controlled by the dc input voltage. It is a type of oscillator in which the output frequency obtained is The major difference single-mode and multimode optical fiber is that in single-mode optical fiber light ray propagates only through a single path. On the contrary, in multimode optical fiber several light rays propagate through the waveguide at the same time. Another crucial difference between single-mode and multimode optical fiber is that single-mode fiber has a smaller core diameter as compared to multimode Definition: A type of multivi*rator whose output consists of 2 stable states is known as Bistable Multivi*rator. The circuit switches from one stable state to the other when an appropriate trigger pulse is applied. In a nutshell, in a bistable multivi*rator, one stable state can be maintained until a triggering pulse is provided. It is also known as flip-flop multivi*rator because due to applied trigger