Indepth Electrical engineering

Thermal overload relays play a very important for protection of motors and generators both. It should be very interesting to know how an Thermal overload works as all over load relays have same working principle. Thermal motor overload protection relays feature bi-metal strips jointly with a trip mechanism in a casing made of insulating material. Whenever there is overload The motor current heats the bi-metal strips, making them bend and activating the trip mechanism after a particular interval which is based on the current- setting. The release mechanism actuates an auxiliary switch that breaks the motor contactor's coil circuit as shown in circuit diagrams below. A changing position indicator signals the condition "tripped". Above diagrams shows where overload is connected in motor circuit. You may see that in Control circuit overload relay comes first in line but in power circuit it comes at last in line. Question arises why this is done?? This al...

There are two types of supplies and there are two types of motors known as :- 1. AC Motors 2. DC Motors Here we will discuss about DC motors working principle. These DC motors works on the principle that when there is a current carrying conductor put in a magnetic field it will experiences a torque. This is called motoring activity.  If the direction is reversed. Then this will act as a generator. Electrically structurally and construction wise a direct current generator is just the reverse, although it is precisely just like a DC motor.  Block diagram for the same is shown below. Here we derive mechanical energy in the output signal interface and provide electrical energy to the input signal interface. i.e. is called as DC motor and for DC generator it is reverse i.e. mechanical at I/p and we get electrical energy at the O/p. Direction of rotation of DC motor is given by Fleming left hand rule The direct current motor's input and...

Servomotors are of two types as described below:- Servomotor is controlled with the aid of servomechanism. It's generally known DC Servo Motor, if the motor as managed apparatus, connected with servomechanism is DC motor. If AC operates the restricted motor, it's called AC Servo Motor. You should take a look, to completely understand the method by which the servo functions. Inside is a fairly straightforward setup there are following components of servomotor: a control circuit, and a small DC motor, potentiometer. Supplies attach the motor to the control wheel. As the motor rotates, the potentiometer's resistance changes can exactly modulate in which way and how much motion there's. Electricity provided to the motor is discontinued, when the rotating shaft is at the wanted position. The proper direction is turned in. The desired position is sent through the signal cable via electric pulses. If the motor is near the wanted position, it'll turn slowl...

🔥 Induction Cooker: How It Works, Benefits, and Comparison with Gas & Electric Stoves ✅ Introduction: Why Induction Cookers Are Gaining Popularity Induction cookers are transforming modern kitchens. Unlike traditional gas or electric stoves, induction technology offers faster cooking, higher efficiency, and improved safety . With growing energy costs and urban lifestyles, more households are switching to induction cooktops. ⚡ What Is Induction Cooking? Induction is a third form of cooking technology (after gas combustion and electric resistance). Instead of producing heat that transfers to the pan, induction makes the pan itself generate heat using magnetic fields. Gas Stove: Burns fuel to create flame → heats cookware. Electric Stove: Uses resistance coil or halogen → transfers heat to pan. Induction Stove: Creates electromagnetic field → pan heats directly. Microwave: Heats food molecules directly (different principle)...

From Edison’s Bulb to CFLs: How Lighting Evolved Toward Energy Efficiency For more than a century, the incandescent bulb has symbolized innovation and fresh ideas. Yet, from a technological standpoint, it has barely changed since Thomas Edison’s introduction in the late 19th century. An incandescent lamp generates light by heating a tungsten filament until it reaches 4,172°F (≈2,300°C) — hot enough to glow white. While this produces illumination, it comes at a heavy cost: only about 10% of the electrical energy is converted into visible light, while the remaining 90% is wasted as heat . Considering that much of the world’s electricity is still produced in coal-fired power plants , incandescent lighting contributes significantly to greenhouse gas emissions . Enter Compact Fluorescent Lamps (CFLs) In the search for greener alternatives, compact fluorescent lamps (CFLs) emerged as a breakthrough. Unlike incandescent bulbs, CFLs don’t rely on heating a filament. Instead, they o...

Working of Single Phase Induction Type Energy Meter (Watt-hour Meter) Introduction An Electric Meter or Watt-hour Meter is a device that measures the quantity of electrical energy consumed by a load. The standard unit of measurement is the kilowatt-hour (kWh) , which represents the energy needed to supply 1,000 watts of power for one hour. Electric utility companies install energy meters at consumer premises to measure electricity usage and bill accordingly. Traditionally, induction-type watt-hour meters are most widely used for AC circuits, while modern systems increasingly employ electronic meters for higher accuracy and data capabilities. Construction of Single-Phase Induction Type Energy Meter A single-phase induction-type watt-hour meter mainly consists of the following systems: Driving System Contains a shunt magnet with a coil of many turns, connected across the supply voltage. The coil is highly inductive, ensuring that the flux it produces lags the supply v...

Chargeable batteries are created and used extensively now for different programs. But with no battery charger these batteries can not become rather valuable. Learn how a battery charger works in this post. Introduction   Whether the battery-charger your mobile phone, emergency light or the vehicle you possess, the considerable use of batteries is evident everywhere. Chargeable batteries can also be popular in inverter's, where its DC voltage is converted into mains AC voltage and can be used to power the household appliances during mains power failure. The need for a battery is based on the fact that it is electricity that you can carry. Additionally when the electricity in a battery gets exhausted, it topped up and could be refilled or charged (clearly that is accurate simply with the chargeable ones) making it a very efficient and a power house that is economic. A battery charger circuit may be consistent and fairly straightforward in design but usually batteries do not l...