3.0 - Electricity, Components and Circuits
... T5D03 -- What formula is used to calculate resistance in a circuit? A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current ...
... T5D03 -- What formula is used to calculate resistance in a circuit? A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current ...
Amateur Radio Technician Class License Study Guide
... communications with any country whose administration has notified the ITU that it objects to such communications. [97.111(a)(1)] During an Armed Forces Day Communications Test an FCC-licensed amateur station may exchange messages with a U.S. military station. [97.111(a)(5)] The transmission of codes ...
... communications with any country whose administration has notified the ITU that it objects to such communications. [97.111(a)(1)] During an Armed Forces Day Communications Test an FCC-licensed amateur station may exchange messages with a U.S. military station. [97.111(a)(5)] The transmission of codes ...
Enhanced EE2003-based Short Wave Receiver
... both AM and SSB reception for the complete frequency range. To do so, take the following steps: Turn the main tuning dial (variable capacitor) to the right, tuning in a station on the 49m band, which corresponds to a low frequency. Set the regeneration level at maximum by setting the regeneration ...
... both AM and SSB reception for the complete frequency range. To do so, take the following steps: Turn the main tuning dial (variable capacitor) to the right, tuning in a station on the 49m band, which corresponds to a low frequency. Set the regeneration level at maximum by setting the regeneration ...
Circuits - Lake Area Radio Klub
... A. So the source can deliver maximum power to the load B. So the load will draw minimum power from the source C. To ensure that there is less resistance than reactance in the circuit ...
... A. So the source can deliver maximum power to the load B. So the load will draw minimum power from the source C. To ensure that there is less resistance than reactance in the circuit ...
2013
... 4. a) Draw the current locus for a series R-L circuit. b) A coil of 2.2Ω resistance and 0.01H is connected in series with a capacitor across 220V mains. Find the value of capacitance such that the maximum current flows in the circuit at a frequency of 100Hz. Also, find the current and voltage across ...
... 4. a) Draw the current locus for a series R-L circuit. b) A coil of 2.2Ω resistance and 0.01H is connected in series with a capacitor across 220V mains. Find the value of capacitance such that the maximum current flows in the circuit at a frequency of 100Hz. Also, find the current and voltage across ...
Oscillators
... resonant LC circuit. It should also be noted that there is very little difference between and . The spacing between these frequencies in the response curve (Figure 18-10) is exaggerated for illustrative purposes only. A crystal can produce outputs at its resonant frequency and at harmonics of that r ...
... resonant LC circuit. It should also be noted that there is very little difference between and . The spacing between these frequencies in the response curve (Figure 18-10) is exaggerated for illustrative purposes only. A crystal can produce outputs at its resonant frequency and at harmonics of that r ...
“GROUND”? - Montana State University
... applies: the dynamic range of an audio system is constrained by the dynamic range of each stage. ...
... applies: the dynamic range of an audio system is constrained by the dynamic range of each stage. ...
Crystal radio
A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of copper wire for adjustment, a capacitor, a crystal detector, and earphones. They are distinct from ordinary radios as they are passive receivers, while other radios use a separate source of electric power such as a battery or the mains power to amplify the weak radio signal so as to make it louder. Thus, crystal sets produce rather weak sound and must be listened to with sensitive earphones, and can only receive stations within a limited range.The rectifying property of crystals was discovered in 1874 by Karl Ferdinand Braun, and crystal detectors were developed and applied to radio receivers in 1904 by Jagadish Chandra Bose, G. W. Pickard and others.Crystal radios were the first widely used type of radio receiver, and the main type used during the wireless telegraphy era. Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment medium around 1920.After about 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes (Audions), and became obsolete for commercial use. They, however, continued to be built by hobbyists, youth groups, and the Boy Scouts as a way of learning about the technology of radio. Today they are still sold as educational devices, and there are groups of enthusiasts devoted to their construction who hold competitions comparing the performance of their home-built designs.Crystal radios receive amplitude modulated (AM) signals, and can be designed to receive almost any radio frequency band, but most receive the AM broadcast band. A few receive shortwave bands, but strong signals are required. The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.