Md Nazmul Islam

⚡ Safe Handling of Live Wires and Circuits 🔎 Hazards of Improper Handling Electrical Shock – direct contact with live wires. Fire Risk – overloaded/damaged wires can overheat. Trip Hazards – loose or messy cables cause accidents. Equipment Damage – poor installation harms devices. 📝 Pre-Installation Safety Site Inspection – check for water, panels, foot traffic. Plan...

🔒 Lockout/Tagout (LOTO) – Why It Matters ⚡ What is Lockout/Tagout? LOTO = Lock + Tag on equipment during repair, servicing, or maintenance. Prevents unexpected startup or release of hazardous energy. Required under OSHA Standard 29 CFR 1910.147. Protects electricians, machine operators, laborers, and other workers. 🛡️ Why It’s Important Creates an Electrically Safe Work Condition...

🛡️ Types of PPE Head Protection – Hard hats with electrical insulation. Eye & Face Protection – Safety glasses, goggles, face shields (for sparks/arc flash). Hearing Protection – Earplugs for noisy equipment. Hand & Arm Protection – Insulated gloves, rubber lineman gloves, protective sleeves. Foot & Leg Protection – Non-conductive safety shoes, dielectric overshoes. Body...

Keep equipment away from water – Maintain at least 5 feet distance and use GFCIs to prevent shocks and fire hazards. Unplug safely – Always pull from the plug, not the cord, to avoid damage and electric shock. Install & tidy cords – Ensure proper installation and keep cords neat and...

A simple circuit with a single resistor connected to a voltage source (battery). Charges move through the resistor from the positive terminal of the source to the negative. The animation often shows little dots or markers representing electric charge or current flow. From the resistor’s point of view The resistor resists the flow...

What a triangle wave is A triangle wave is a periodic waveform that linearly ramps up then linearly ramps down (or vice versa), forming a triangular shape. It has slope changes at the peaks (sharp corners), unlike sine waves which are smooth. What Fourier series does here Fourier series lets you express a...

What is a square wave A square wave is a periodic waveform that switches between two levels (for example +A and −A, or “on” and “off”) with instantaneous transitions. It’s one of the basic waveforms in electronics, signal processing, music synthesis etc. What is shown in the image The waveform alternates between two...

A Sinusoidal wave in the context of Electrical or Electronics Engineering is used to represent a time-varying voltage or current whose average value in a cycle is zero. Mathematically, this waveform can be represented by the equation.

Alternating Voltage (AC Voltage): Voltage that changes direction periodically, usually in a sinusoidal pattern. A sine wave represents AC voltage and current. Voltage and current rise from 0 → maximum → 0 → negative maximum → 0, repeatedly.

As you can see, the current through the coil is 90° out of phase - and delayed. Why? The periodically alternating current flow creates a magnetic field in the coil that also alternates periodically. This alternating magnetic field in turn results in an induction voltage, which (according to...

An ultrasonic sensor is a device that measures distance or detects objects by sending out ultrasonic sound waves and measuring the time it takes for the echo to return. It’s commonly used for obstacle detection, level measurement, and proximity sensing.

Pressure Sensors measure the force exerted by a fluid (liquid or gas) and convert it into an electrical signal. Common types: Strain Gauge Sensors – detect pressure via deformation of a material. Piezoelectric Sensors – generate voltage when pressure is applied. Capacitive Sensors – change capacitance with pressure changes. Used in industrial automation, hydraulics,...