Electrical4U 
What is a Flip-Flop? A flip-flop is defined as a sequential digital circuit that can store one bit of binary data. A bit is the smallest unit of information that can have two possible values: 0 or 1. A flip-flop has two stable states, which means it can retain its output value even after the … Read more
A stepper motor is a synchronous brushless DC motor whose driver moves the stator magnetic field through a sequence of discrete positions. The rotor follows that field in steps while the load remains within the motor’s torque-speed limit. Many systems run open-loop, but feedback is optional rather than forbidden. A position sensor can detect errors … Read more
Octal is base 8 and uses the digits 0 through 7. Binary is base 2 and uses 0 and 1. Because 8 = 2³, each octal digit corresponds to exactly three binary digits. This article explains direct binary to octal conversion and the longer decimal cross-check. What is Octal? An octal numeral uses positional powers … Read more
Metal-enclosed switchgear places primary switching and protective equipment inside a metal enclosure. Depending on its class and rating, an assembly can contain circuit breakers, switches, fuses, busbars and current transformers. It controls and protects utility, commercial or industrial circuits at the specified voltage. The equipment nameplate and governing standard identify the exact class; the metal … Read more
An electric water heater uses electricity to heat water for domestic or commercial purposes. Three main designs cover the field: normal plate heaters, immersion heaters and geyser heaters. Each works differently, carries its own trade-offs and demands its own safety habits. What is a Normal Plate Heater? A normal plate heater is a basic, affordable … Read more
Parity generators and checkers guard data movement in digital systems. They append one extra bit, the parity bit, so that single-bit errors caused by noise or interference become detectable at the receiving end. The sections below cover the parity concept, the generator and checker circuits and where they earn their keep. What is Parity Checking? … Read more
Photometry measures optical radiation after applying a defined model of human visual sensitivity. Unlike radiometry, which measures radiant energy without this visual weighting, photometry describes light using agreed spectral luminous efficiency functions. Visible light is often described as spanning roughly 380 nm to 780 nm, but the eye has no sharp wavelength cutoff. Sensitivity falls … Read more
Mechanical work and heat are two forms of the same thing: energy. The mechanical equivalent of heat puts a number on that exchange, and the experiments behind it carried physics into the science of thermodynamics. What is the Mechanical Equivalent of Heat? The mechanical equivalent of heat is a term that describes the relationship between … Read more
A digital logic gate maps one or more binary input states to an output state according to a Boolean function. Gates form combinational circuits and, with feedback or storage elements, sequential circuits. This article covers common gate functions, truth tables, transistor logic families and practical loading limits. What is a Digital Logic Gate? A digital … Read more
A radiation pyrometer infers surface temperature from thermal radiation received at a distance. Unlike thermocouples and resistance temperature detectors RTDs, it does not touch the target. Its usable temperature range depends on the detector, spectral band, optics and target conditions, so there is no universal 750°C lower limit. What is a Radiation Pyrometer? A radiation … Read more