Piezoresistive Pressure Sensors Piezoresistive sensors (also known as strain-gage sensors) are the most common type of pressure sensor in use today. Piezoresistive effect refers to a change in the electric resistance of a material when stresses or strains are applied. Piezoresistive materials can be used to realize strain gages that, when incorporated into diaphragms, are […]
Capacitive humidity sensors and capacitive moisture sensors are mostly based on the changes in the permittivity of the dielectric material. The permittivity of atmospheric air, some gases, and many solid materials are functions of their moisture contents and their temperature. The main advantage of this type of sensor is that a relatively small change in
Biomass is an organic matter produced by plants, both grown on land (terristial biomass) and grown on water (aquatic biomass) and their derivatives and animal manure. The energy obtained from biomass is called the biomass energy. Biomass can be considered a form of solar energy as it is used indirectly to grow these plants by photosynthesis.
Types of Biogas Plant The biogas plants are built in different sizes and shapes depending on the process carried out. These plants are mainly classified as: Continuous or Batch Type Biogas Plants In the continuous type of biogas plant the biomass is fed regularly to the digester and it delivers the biogas continuously. Continuous type
The biogas is produced by digestion, hydrolysis and hydro-gasification. The composition of biogas is as follows: The presence of CO2, in biogas reduces its octane rating. The octane rating of biogas is 110 with CO2. In case the CO2 is removed from the biogas (CH4) its octane rating increases to about 130 as against the
Power in AC Circuit The instantaneous power of an AC waveform is given by p(t) = v(t) · i(t) Power in a Resistance The current and voltage are in phase on the resistor (Fig. 1). For a sinusoidal voltage, the instantaneous power is Here V and I are the RMS values of the voltage and
The three most commonly used electrical test instruments are: the clamp-on amp meter, the AC voltmeter, and the Ohmmeter. These three meters are commonly known today as digital multimeters (DMM). It is vitally important that electrical personnel know how to correctly use a DMM. These meters are used to not only understand how an electrical
This article covers the following items about electrical timers: The five sections of timers Nine timer operating principles Five common modes of timer operations Timer charts Sections of Electrical Timer Figure 1 provides a block diagram that shows the five functional sections of a timer. Timers can be divided into the following sections: Power or
Variable Frequency Drive Working A variable frequency drive (VFDs) uses solid state electronic circuits to provide a signal to a motor to control its acceleration, deceleration, direction of rotation, torque, and horsepower. Drives do this by converting a fixed frequency (either 50 or 60 Hz) AC power source, to a variable frequency power supply to
Generally, it can be stated that a circuit breaker is intended to protect the electrical conductors in the circuit from overheating. It can also be stated that the equipment grounding conductor (EGC) is required by the NEC to be connected so that a low impedance fault current path is provided for the main purpose of