Tech Terms

It is important to understand some simple, general principles in order to have a full grasp of Electricity and Electronics

Amplitude and phase tables for RC circuits

What is CR Circuit?

A CR circuit is one that contains both capacitors and resistors (either in series or in parallel). The action of a CR circuit upon a sine wave is to change both the amplitude and the phase of the output signal as compared to the input signal. Universal amplitude/phase tables can be prepared, using the time […]


What is Reactance of Capacitor?

The reactance of a capacitor for a sine wave signal is given by: where C is the capacitance, in farads and f is frequency, in hertz. Reactance is measured in units of ohms and is defined by the ratio: ˜V/˜I or v/i using the convention noted below,  where ˜V is the AC voltage across the […]

Capacitor charging and discharging

Time Constants Of Capacitor

The charging and discharging of a capacitor is never instant. When a sudden step of voltage is applied to one plate of a capacitor, the other plate voltage will step in voltage by the same amount. If a resistor is present that connects the second plate to a different voltage level the capacitor will then […]


What is Capacitance?

Two conductors that are not connected and are separated by an insulator constitute a capacitor. When a source of EMF such as a cell is connected to such an arrangement, current flows momentarily, transferring change (in the form of electrons) from one conducting plate (the + plate) to the other. When a quantity of charge […]

Thermistor bridge for temperature measurement

What is Thermistors?

Thermistors are resistors made from materials that have large values of temperature coefficient. Both PTC and NTC types are produced for applications that range from temperature measurement to transient current suppression. Figure shows some representative types. Miniature thermistors either in bead form or in glass tubes are used for temperature measurement, using a bridge circuit […]

What do mean by 3dB Cutoff Frequency? Why is it 3dB, not 1dB?

3dB implies 70%(o.7o7) of the power,i’e we r interested to consider the bandwidth range from peak to 70% b’coz uptp 70% its reliable.hence 3dB is called as half power freq. 3dB value is the mean square value which is 70% of the maximum value.

What is EBCDIC?

EBCDIC (Extended Binary Coded Decimal Interchange Code) is an 8-bit character encoding used on IBM mainframe operating systems

What is ASCII?

ASCII (American Standard Code for Information Interchange), is a character encoding based on the English alphabet.

What is Biasing?

Biasing is a process of connecting dc voltage to a device by which we can select the operating point of the device. by biasing actually we select the operating point of the device.

Distinguish between Angle Modulation and Amplitude Modulation

Amplitude Modulation In Amplitude Modulation as the amplitude of given signal varies, the amplitude of carrier signal also varies in the same way. Angle Modulation In Angle Modulation, the frequency or phase may vary according to the amplitude of given signal

What is Inter Symbol Interference

In telecommunication, inter symbol interference (ISI) means a form of distortion of a signal that causes the previously transmitted symbols to have an effect on the currently received symbol. This is usually an unwanted phenomenon as the previous symbols have similar effect as noise, thus making the communication less reliable. ISI is usually caused by […]

what is Difference Between SCR and Diode Rectifier?

Diode is a 2 terminal device, in SCR gate controls the rectifying. SCR is used in High frequency applications but diode is low frequency devices, SCR can be in high temperatures but not diode.

What is Op-Amp?

An operational amplifier, often called an op-amp , is a DC-coupled high-gain electronic voltage amplifier with differential inputs and, usually, a single output. Typically the output of the op-amp is controlled either by negative feedback, which largely determines the magnitude of its output voltage gain, or by positive feedback, which facilitates regenerative gain and oscillation.

What is Transistor?

In electronics, a transistor is a semiconductor device commonly used to amplify or switch electronic signals. The transistor is the fundamental building block of computers, and all other modern electronic devices. Some transistors are packaged individually but most are found in integrated circuits.

What is Diode?

In electronics, a diode is a two-terminal device. Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional current property.

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