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June Fact-of-the-Day Index

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DateFact of the Day Topic
June 1Electron Attraction and Repulsion Gravity attracts two electrons towards each other, but their identical negative charges cause an electrical repulsion ...
June 2Signal-to-Noise Ratio (SNR) Signal and noise can be measured in power, or in rms voltage or current, and the ratio can be expressed in decibels ...
June 3Audio Amplitude Distortion Audio frequency response gets lots of attention, but amplitude distortion tends to degrade audio quality more than ...
June 4Amplitude Distortion Calculation Waveform amplitude distortion can be calculated using at least three different methods. One method is ...
June 5External Radio Noise Sources Radio receivers tuned to any frequency used for communication are subject to interference from one of more of the ...
June 6True Electrical Quantity Measurements True measurements of electrical quantities such as current, resistance, voltage, reactance, frequency ...
June 7Simultaneously Opposing Currents that Sum Electrical conduction can occur only if charged particles are available to move through a conducting circuit ...
June 8Liquid Electrical Conduction Electrical conduction through liquids is called electrolytic conduction. The charged particles needed to carry ...
June 9RF Stub Line Practical Frequency Range Parallel-conductor or coaxial transmission line stubs or transformer-sections often are ...
June 10Waveguide Standing Wave Measurement Electric and magnetic fields are completely contained by a waveguide, so it is necessary to insert ...
June 11Single Sideband Signal Generation A common method of generating a single-sideband (SSB) signal is to split an incoming audio intelligence signal ...
June 12Accurate Receiver Selectivity Testing Radio receiver selectivity generally can be measured most accurately by 1) tuning both a receiver and ...
June 13Two Types of Audio Distortion Audio can be distorted a variety of ways, but the two most common types of distortion in AM and FM communication ...
June 14Audio Amplifier Negative Feedback A small amount of the output signal from an audio amplifier can be fed out-of-phase back to the amplifier input to ...
June 15Exceeding Capacitor Voltage Ratings Many capacitors can be operated at voltages significantly above their maximum DC voltage ratings ...
June 16Electrolytic Capacitor Polarity Most types of capacitors do not have a specified polarity and they can be used with either polarity. That is not true of ...
June 17Horn Antennas Horn antennas are fundamentally waveguides that expand in height, width or both to some finite length. The maximum possible gain ...
June 18U.S. HDTV Intolerant of Multipath Europe and the United States adopted different High-Definition Television (HDTV) transmission methods ...
June 19Transmission Line Mechanical Analogy Imagine you have one end of an infinite-length rope in your hand. You move your hand up and down with a ...
June 20Feed-Line Mismatch Mechanical Analogy If a mechanical wave was induced into one end of an infinite length rope, the wave would propagate ...
June 21Electric Shock Effects Some people think they will be able pull their hands away if they accidentally touch an electrical conductor charged with enough ...
June 22Electric Shock Voltage and Current High-voltage is dangerous because human contact with high-voltage can cause a dangerous amount of current ...
June 23The First Battery Between 1788 and 1791 Luigi Galvani developed an 'animal electricity' theory after discovering that a salinated dead frog ...
June 24The Origin of Ohm's Law Georg Simon Ohm was born in Bavaria in 1789. His father taught him philosophy, chemistry, mathematics and physics ...
June 25Wheatstone Bridge Invention Ask almost anyone who has studied electricity or electronics who invented the Wheatstone Bridge, an ingenious circuit ...
June 26Francis Hauksbee's Experiments You may have never heard of Francis Hauksbee, but he conducted a series of brilliant experiments in ...
June 27Dynamic Microphone Invention The dynamic microphone was invented in 1877 by Curttris and Redding working together in the United States and by ...
June 28Wheatstone Bridge Variations From DC up to about 150 MHz Wheatstone bridges, or other bridges that are merely modified forms of ...
June 29Low Frequency Audio in Small Rooms Audio buffs know high-fidelity sound systems nearly always produce more bass in large than in small rooms, but ...
June 30Computer Fan Maintenance Computer reliability is highly dependent on adequate cooling. A large percentage of computer problems result directly or ...

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