An electrical load is a component or device in an electrical circuit that draws electrical power from the power source and converts it into another form of energy to perform a specific function. Examples of Electrical Loads 💡 LED Bulb – Converts electrical energy into light. 🌀 Ceiling Fan – Converts electrical energy into mechanical motion. 🔥 Electric Heater – Converts electrical energy into heat. 📺 Television – Converts electrical energy into light and sound. 💻 Laptop or Computer – Uses electrical energy for processing and display. 📱 Mobile Phone Charger – Consumes electrical energy to charge a battery. ow an Electrical Load Works An electrical load works only when there is a closed circuit. A power source (battery or AC supply) provides voltage. The electrical load is connected to the power source. Current flows through the load. The load converts electrical energy into useful output such as light, heat, or motion. Types of Electrical Loads 1. Resistive Load A resistive load converts electrical energy mainly into heat. Examples: Electric Iron Electric Heater Incandescent Bulb Toaster Characteristics: Voltage and current are in phase. Power factor is approximately 1. 2. Inductive Load An inductive load contains coils or windings and creates a magnetic field when current flows. Examples: Electric Motor Ceiling Fan Transformer Solenoid Characteristics: Current lags behind voltage. Requires reactive power. 3. Capacitive Load A capacitive load stores electrical energy in an electric field. Examples: Capacitor Banks Power Factor Correction Units Some Electronic Circuits Characteristics: Current leads the voltage. Used to improve power factor. Why Electrical Loads Are Important Electrical loads are important because they: Convert electrical energy into useful forms. Perform useful work in homes, industries, and commercial buildings. Determine how much current is drawn from the power source. Help engineers design safe and efficient electrical systems. Everyday Examples Around Us Appliance Type of Load Output Energy LED Lamp Resistive/Electronic Light Ceiling Fan Inductive Mechanical Motion Water Heater Resistive Heat Air Conditioner Inductive Cooling Refrigerator Inductive Cooling Mobile Charger Electronic Battery Charging Key Points to Remember An electrical load consumes electrical power. Every electrical appliance connected to a power source acts as a load. Loads convert electrical energy into light, heat, motion, sound, or stored energy. The amount of power consumed by a load is measured in Watts (W). Common load types are Resistive, Inductive, and Capacitive. Interview Question Q: What is an electrical load? Answer: An electrical load is any device or equipment that consumes electrical energy from a power source and converts it into another useful form of energy such as light, heat, motion, or sound to perform a specific function. Summary An electrical load is an essential part of every electrical circuit. Without a load, electrical energy cannot perform useful work. From a simple LED bulb to an industrial motor, every device that consumes electricity is considered an electrical load. Understanding different types of electrical loads is the foundation for learning electrical engineering, electronics, and embedded systems.

A resistor is one of the most fundamental passive electronic components used in electrical and electronic circuits. Its primary function is to limit or control the flow of electric current, protect sensitive components, divide voltage, and regulate circuit operation. In this lesson, learners will understand the definition of a resistor, its working principle, unit of measurement (Ohm – Ω), circuit symbol, and color coding used to identify resistance values. The lesson also introduces the different types of resistors, including fixed resistors, variable resistors, and power resistors, along with their practical applications in real-world electronic devices. Students will explore how resistors are used in circuits to protect LEDs, control current, create voltage dividers, and ensure reliable operation of embedded systems. By the end of this lesson, learners will have a strong foundation for understanding resistor selection, circuit design, and troubleshooting in electrical and embedded engineering. Learning Outcomes After completing this lesson, learners will be able to: Define a resistor and explain its purpose. Identify the resistor symbol used in electrical circuits. Understand the unit of resistance (Ohm – Ω). Explain how resistors control current flow. Identify different types of resistors and their applications. Read basic resistor color codes. Recognize practical uses of resistors in electrical and embedded systems. Key Topics Covered What is a Resistor? Functions of a Resistor Unit of Resistance (Ohm – Ω) Resistor Symbol Types of Resistors Resistor Color Code Practical Applications Real-World Examples Real-World Applications Resistors are found in almost every electronic device, including: Mobile phone chargers LED lighting circuits Computers and laptops Televisions Automotive electronic systems Industrial control systems Embedded system development boards (Arduino, STM32, ESP32, Raspberry Pi Pico) Summary Resistors are the building blocks of electronic circuits. Understanding their operation is essential for anyone learning electrical engineering, electronics, or embedded systems. This lesson provides the knowledge required to analyze circuits, protect electronic components, and design reliable embedded hardware.