Electrical4U 
A bimetal is defined as an object that is composed of two separate metals joined together by a metallurgical process. Unlike alloys, which are mixtures of two or more metals, bimetals consist of layers of different metals that retain their individual attributes. Bimetals can also be called bimetallic products or bicomponent materials. Bimetals have two distinct metallic … Read more
A planar circuit is a circuit that can be drawn on a flat surface without any wires crossing each other. A non-planar circuit is a circuit that cannot be drawn on a flat surface without any wires crossing each other. Planar and non-planar circuits have different properties and methods of analysis. In this article, we … Read more
A Johnson counter is a type of digital sequential logic circuit that can be used to count the number of events or pulses that occur in a system. It is also known as a twisted ring counter, a walking ring counter, a creeping counter, or a switch-tail counter. In this article, we will explain what … Read more
A feeder protection relay is a device that protects power system feeders from various types of faults, such as short circuits, overloads, ground faults, and broken conductors. A feeder is a transmission or distribution line that carries power from a substation to the load or another substation. Feeder protection relays are essential for ensuring the … Read more
A monostable multivibrator is defined as a relaxation oscillator that produces a single output pulse of a specified duration when triggered by an external signal. It has one stable state and one unstable state, returning to the stable state automatically after a set period. The pulse duration is determined by the RC time constant of … Read more
Earth resistance is defined as the resistance offered by the earth electrode to the flow of current into the ground. It is also known as resistance to earth or ground resistance. Earth resistance is an important parameter for designing and maintaining earthing systems, as it affects the safety and performance of electrical installations. What is … Read more
A binary number is a number that consists of only two digits: 0 and 1. The binary number system is also known as the base-2 system because each digit represents a power of 2. For example, the binary number 1011 represents 1×2^3 + 0×2^2 + 1×2^1 + 1×2^0, which is equal to 11 in decimal. … Read more
What is a Lamp? A lamp is defined as an artificial source of light that can be used for illumination, decoration, or signaling. Lamps have been around for thousands of years, evolving from simple vessels filled with animal fat and wicks to sophisticated devices that use electricity, gas, or solar power. Lamps can vary in … Read more
What is an Armature? An armature is the component of an electric machine (i.e., a motor or generator) that carries alternating current (AC). The armature conducts AC even on DC (Direct Current) machines via the commutator (which periodically reverses current direction) or due to electronic commutation (e.g., in a brushless DC motor). The armature provides … Read more
What is a Circuit Breaker? A circuit breaker is defined as a switching device that can be operated manually or automatically for controlling and protecting an electrical power system. It consists of two main contacts: a fixed contact and a moving contact. The contacts are normally closed and allow current to flow through the circuit. … Read more