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deppe co electrical components are transducers that convert guided waves propagating on transmission lines into electromagnetic waves propagating in an unbounded medium (typically free space), or perform the reverse conversion. They are components in radio equipment used to transmit or receive electromagnetic waves. Engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, and radio astronomy, which use electromagnetic waves to transmit information, all rely on antennas for operation. Furthermore, in terms of transmitting energy via electromagnetic waves, non-signal energy radiation also requires antennas. Generally, antennas possess reciprocity, meaning the same antenna can be used as both a transmitting and a receiving antenna. The basic characteristic parameters of the same antenna for transmission or reception are identical. This is the reciprocity theorem of antennas. As we know, radio equipment such as communication, radar, navigation, broadcasting, and television devices all transmit information via radio waves and require the radiation and reception of radio waves. In radio equipment, the device used to radiate and receive radio waves is called an antenna. The antenna provides the necessary coupling between the transmitter or receiver and the medium through which radio waves propagate. Like transmitters and receivers, the antenna is also an important component of radio equipment.

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The main characteristics of thermistors are: (1) high sensitivity, with a resistance temperature coefficient larger than that of metals; (2) wide operating temperature range; (3) small size, capable of measuring temperatures in gaps, cavities, and blood vessels within living organisms that other thermometers cannot measure; (4) ease of use; (5) easy to process into complex shapes and suitable for mass production; (6) good stability and strong overload capacity.

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Photoelectric sensors using photoelectric elements as sensitive components are diverse and widely used. Based on the nature of the output quantity of photoelectric sensors, they can be divided into two categories: (1) Photoelectric measuring instruments that convert the measured quantity into a continuously changing photocurrent, used to measure physical quantities such as light intensity, object temperature, light transmittance, displacement, and surface condition. Examples include illuminance meters for measuring light intensity, photoelectric pyrometers, photoelectric colorimeters and turbidimeters, photoelectric alarms for fire prevention, and automatic inspection devices and instruments for checking the diameter, length, ellipticity, and surface roughness of machined parts, all of which use photoelectric elements as their sensitive components. Semiconductor photoelectric elements are not only widely used in civil industrial fields but also hold an important position in military applications. For example, lead sulfide photoresistors can be used to make infrared night vision devices, infrared cameras, and infrared navigation systems; (6) Converting the measured quantity into a continuously changing photocurrent. Various photoelectric automatic devices are made using the characteristic of photoelectric elements outputting "present" or "absent" electrical signals when exposed to light or no light. Photoelectric elements are used as switching photoelectric conversion components. Examples include photoelectric input devices for electronic computers, switching temperature control devices, and digital photoelectric tachometers for speed measurement.

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In power generation, transformation, transmission, distribution, and consumption circuits, current levels vary significantly, ranging from a few amperes to tens of thousands of amperes. For ease of measurement, protection, and control, it is necessary to convert these to a more uniform current level. Additionally, voltages on lines are generally high, making direct measurement very dangerous. Current transformers serve the purpose of current conversion and electrical isolation. For analog ammeters, the secondary current of current transformers is mostly at the ampere level. For digital instruments, the sampled signal is generally at the milliampere level. The secondary current of miniature current transformers is at the milliampere level, primarily serving as a bridge between large transformers and sampling. Miniature current transformers are also referred to as "instrument current transformers." ("Instrument current transformers" implies precision current transformers with multiple current ratios used in laboratories, generally for extending instrument ranges.) Similar to transformers, current transformers operate based on the principle of electromagnetic induction; transformers convert voltage, whereas current transformers convert current. The winding of the current transformer connected to the measured current is called the primary winding; the winding connected to the measuring instrument is called the secondary winding. The ratio of the primary winding current I1 to the secondary winding I2 current is called the actual current ratio K. The current ratio when the current transformer operates at rated current is called the rated current ratio of the current transformer, denoted by Kn.

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