Electrical Tips, News & DIY Guides
When a transformer is supplied with a fixed applied voltage at its primary winding, the secondary terminal voltage does not always remain constant. If the magnitude or power factor of the load connected to the secondary side changes, a corresponding change in is observed. This change occurs due to the voltage drops across the winding … Read more
1. Introduction Transformers are vital components in electrical power systems, used to step up or step down voltages efficiently. However, a real transformer is not perfect — it has losses and non-idealities. The equivalent circuit is a simplified model that represents these imperfections, helping engineers analyze and design transformers effectively. 2. What is an Equivalent … Read more
1. Introduction A transformer is a key device in electrical power systems. It moves electrical energy from one circuit to another using electromagnetic induction. In an ideal world, transformers would work perfectly with no losses or voltage drops. But in real life, they have limits. One important factor is leakage reactance. This affects how well … Read more
Operation of Transformer in On-Load Condition To understand the operation of a transformer in load, let us first recall its on-load condition. In the on-load state, when an input voltage is applied across the primary winding, a small on-load current flows. This current establishes a magnetic flux in the transformer core. What is a Transformer? … Read more
Difference Between Ideal and Practical Transformer When it comes to learning about transformers, two terms often pop up: ideal transformer and practical transformer. They sound similar, but there’s a big difference between them. Let’s explore it in a way that’s easy to understand. What is a Transformer? A transformer is an electrical device that transfers … Read more
Understanding the brake test of dc motor: Imagine trying to find out how well a DC motor is working—how much of the electrical power it uses turns into useful mechanical work. One easy and direct way to check this in a lab is by do something called a Brake Test. Let’s break it down in … Read more
Two-Point Starter A two-point starter is used for starting DC series motors. It is a simple device that helps control the starting current to prevent damage to the motor. A Two-Point Starter is a simple device used FOR safely starting a DC series motor. When a motor starts, it can draw a large amount of … Read more
Three-Point Starter A three-point starter is commonly used to safely start DC shunt motors. Just like the two-point starter, it controls the high inrush of current when the motor is switched on. But this one comes with an added feature—overload and no-voltage protection, making it more reliable. What is a Three-Point Starter? The name “three-point” … Read more
DC Motor Starter: DC motors, especially those below 1 HP (0.746 kW), can often be directly connected to a power supply. This is possible because smaller motors have a relatively high armature resistance (Ra), which naturally limits the starting current. Some examples include: However, this direct online starting method cannot be used with larger motors … Read more
What Is Speed Regulation? Think about riding a bicycle. When you’re going downhill with no backpack, it’s super fast and smooth. But going uphill with a heavy bag? How to calculate the speed regulation of DC motors? DC motors act the same way. When there’s no load, they run fast. When there’s a heavy load, … Read more