Are you looking for the Top 20 Polytechnic Colleges in UP Government? If yes, then you’ve come to the right place! Whether you’re a student, a parent, or just someone curious about technical education, this guide will help you understand everything in the simplest and clearest way. Polytechnic colleges are a great option for students … Read more
Open circuit and short circuit What is an Open Circuit? | An open circuit means there is a break or gap in the path where electricity should flow. Imagine a road where a bridge is broken — cars can’t pass through it. In the same way, when a wire or part of the circuit is … Read more
Introduction to Magnetic Circuits We all know that magnets can pull things like pins or nails. But have you ever wondered how this invisible pull works inside machines like fans, motors, or transformers? Well, it’s all about something called a magnetic circuit. Just like electric current flows in a loop through wires in an electric … Read more
Magnetic Hysteresis When we take a piece of magnetic material—like iron—and magnetise it first in one direction, and then in the opposite direction, something interesting happens. The magnetic strength inside the material does not follow the applied force exactly. Instead, it lags behind. This delay is called Magnetic Hysteresis. 🔄 What is Magnetic Hysteresis? Magnetic … Read more
Magnetic Flux Density Have you ever seen how magnets pull things without touching them? This invisible force spreads out in space like magic. But how do we measure this magnetic power in a certain area? That’s where Magnetic Flux Density comes in. 🌟 What is Magnetic Flux Density? Magnetic Flux Density is a way to … Read more
Definition of Parallel Plate Capacitor A parallel plate capacitor is a device made of two flat, conductive plates placed parallel to each other with a small gap between them. This gap is usually filled with air or a material called a dielectric. When we connect a battery or voltage source across the plates, one plate … Read more
what is magnetism? Long ago, people thought magnetism was a kind of magic. They didn’t understand how it worked, so they didn’t use it much. But as time passed and science grew, we learned the truth — magnetism is not magic, it’s a real and powerful force. Today, magnetism is one of the most important … Read more
Introduction to Capacitors: We all know that different objects can hold different amounts of electric charge, even when they are at the same voltage. This ability to store charge is called capacitance. To store a useful amount of charge, we use a special device called a capacitor. A capacitor is made of two metal plates placed close … Read more
Cylindrical Capacitor A Cylindrical Capacitor consists of two concentric conducting cylinders separated by an insulating dielectric material. The formula gives its capacitance (C): C = (2π ε₀ εᵣ L) / ln(b/a) where: This type of capacitor is widely used in underground and coaxial cables, where the cylindrical geometry provides uniform electric field distribution and efficient … Read more
Capacitors in Series and parallel Let’s imagine you have three capacitors — we’ll call them C₁, C₂, and C₃.Now, we connect them one after another, like links in a chain. This is called a series connection. When we apply a voltage V across this whole chain, something interesting happens: Now, remember a simple rule:Q … Read more
Insulators Dielectric insulators are materials that do not let electric current pass through them easily. This is because they have almost no free electrons inside them. You can think of them like strong walls that stop electricity from going through. Under normal conditions—like regular voltage and temperature—these materials stay safe and do not conduct electricity. … Read more
Conductor Have you ever seen electric wires around you? They carry electricity from one place to another. But have you ever wondered how electricity flows through them so easily? The reason is electrical conductors. A conductor is a material that allows electricity to pass through it easily because it has lots of free electrons. These … Read more
Electricity Electricity is the movement of tiny particles called electrons from one place to another. This movement is also known as the flow of electric charge. Just like water flows through a pipe, electricity flows through wires or other materials. The speed and ease of this flow depend on the kind of material the electrons … Read more
Electric Current Electric current is the flow of tiny particles called electrons. Just like water flows through a pipe, electrons flow through wires. This flow is what we call electric current. We show electric current with the letter I, and its unit is called an ampere (A). You can think of it like measuring how … Read more
Caliper A caliper tool is a special tool used to measure things. It helps us find out the exact size of an object, like how long, wide, thick, or round it is. This tool is very useful when we need to be very accurate with measurements. Calipers are usually made of strong metals like high-carbon … Read more
Chisels A chisel is a very simple but powerful tool. It is mostly used to cut light and thin metal sheets. You can think of it like a strong metal stick that helps in cutting other metals. Chisels are made from high carbon steel. This steel is strong and tough, which makes the chisel strong … Read more
Hammer – The Helping Hand of the Workshop A hammer is one of the most useful and commonly used tools in any workshop. It is a strong hand tool that helps us do many different kinds of work. We use a hammer to: In simple words, jobs like hammering, bending, shaping, cutting, and joining are … Read more
What is Electrical Safety? Electrical safety rules mean staying safe when using electricity. It is all about using electric machines and wires in the right way so that no one gets hurt. Electricity is very useful. It helps us light our homes, run fans, charge phones, and do so many things. But if we do … Read more
what is Files? The process of removing unwanted material in the form of powder by rubbing a rough surfaced tool from the surface of a workpiece is called filing and the cutting tool used for this purpose is called file. With the help of sandpaper, we can remove excess material in the form of fine particles from plane … Read more
electrical interview questions and answers if I connect a capacitor to a generator load? electrical interview questions and answers Answer:When you connect a capacitor to a generator, it helps to improve the power factor. This means it makes the generator work more efficiently. But this only helps if the generator’s engine is strong enough to … Read more
Introduction Many students get confused in Distinguish between centripetal and centrifugal forces because both appear in circular motion, but they act in opposite directions. This confusion often arises: Why understanding the difference is important:Not just for scoring well in exams, but also to grasp the physics behind everyday activities. Let’s break it down simply and … Read more
Understanding Angular and Linear Velocity Imagine you are spinning a wheel. The speed at which the wheel turns is called angular velocity. It tells us how fast something is turning around a fixed point. For example, if a fan is spinning, its blades are moving in a circle. Angular velocity helps us know how quickly … Read more
Circular motion is everywhere around us—the rotation of a ceiling fan, the spinning of a wheel, the moon orbiting the Earth, or the Earth revolving around the Sun.Understanding it is not only essential for students and engineers but also fascinating for anyone who wants to know how and why an object moves along a circular … Read more
INTRODUCTION When we look at the many different things we measure in science—like speed, temperature, or weight—it may seem like we need a different unit for each one. But if we try to make a unique unit for every single thing, remembering all those units would become very confusing and nearly impossible. Luckily, many of … Read more
