The term “transistor” is a combination of “transfer” and “resistor,” reflecting its function as a device that transfers electrical signals or current across a resistor-like component. It was coined to describe the revolutionary semiconductor device developed in the mid-20th century that replaced vacuum tubes in many applications due to its smaller size, lower power consumption, … Read more
Ohm’s Law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, given a constant temperature. In simpler terms, it describes how current (I) behaves in relation to voltage (V) and resistance (R) in an electrical circuit. If you increase the voltage across a … Read more
When a voltage source is connected to a capacitor, initially there is a surge of current as the capacitor charges. This occurs because capacitors act as temporary sinks for electric charge. Once fully charged, a capacitor effectively becomes an open circuit to direct current (DC). This means that while it allows current to flow momentarily … Read more
A color code is used for resistors to indicate their resistance value, tolerance, and sometimes reliability or temperature coefficient. This coding system provides a straightforward, standardized method for identifying these values, especially on small components where printing numerical values would be impractical. The color bands are easy to read and interpret once the code is … Read more
A resistor can have voltage across its terminals when it is part of an electrical circuit where current flows through it. According to Ohm’s Law, voltage (V) across a resistor is equal to the current (I) flowing through it multiplied by its resistance (R), expressed as V = IR. Therefore, whenever current passes through a … Read more
When a conductor is placed between the plates of a capacitor, it effectively shorts out the electric field between the plates. This happens because a conductor allows electrons to move freely across its surface, neutralizing any potential difference between the capacitor plates. As a result, the capacitor loses its ability to store electric charge or … Read more
FET operation is often limited to small signals to ensure linearity and prevent distortion. In small signal conditions, the FET operates within a region where its behavior is predictable and can be approximated by linear equations. This linear operation is crucial for accurate amplification and signal processing. Large signals can drive the FET into non-linear … Read more
Resistors do not cause phase shift in electrical signals. They are passive components that do not store energy in an electric or magnetic field. As a result, resistors do not introduce any phase shift between voltage and current passing through them. The voltage and current across a resistor are in phase with each other, meaning … Read more
A MOSFET input behaves like a capacitor because of its gate structure. The gate of a MOSFET is insulated from the channel by a thin layer of oxide, forming a gate-to-source capacitance. When a voltage is applied to the gate, it creates an electric field that controls the conductivity of the channel. This capacitive nature … Read more
Resistors are fundamentally important components in electronics and electrical circuits due to their ability to control current flow and voltage levels. One key reason for their importance is their role in limiting current. In circuits, resistors are used to regulate the amount of current flowing through various components, ensuring that devices operate within safe and … Read more