A pull-down resistor is a resistor connected between a signal line and ground in a digital circuit. Its purpose is to ensure that the signal line remains at a defined low (logic 0) state when no active device is connected to it. In other words, it pulls the voltage of the signal line down to … Read more
Wiring a resistor in a circuit involves connecting it between two points to control the flow of electrical current. Typically, resistors have two terminals that are not polarity-sensitive, meaning they can be connected in either orientation within a circuit without affecting their functionality. To wire a resistor, you simply insert each lead into the circuit … Read more
What are the differences between UJT and FET ? The differences between UJT (Unijunction Transistor) and FET (Field-Effect Transistor) lie primarily in their construction and operating principles. A UJT is a three-terminal semiconductor device with a unique structure consisting of a bar of lightly doped N-type material and two heavily doped P-type regions. It operates … Read more
A capacitor offers infinite resistance at steady state because, in a DC (direct current) circuit, once it is fully charged, it acts as an open circuit to the steady flow of current. This occurs because a capacitor charges and stores electrical energy in the form of an electric field between its plates. As the capacitor … Read more
A light dependent resistor (LDR), also known as a photoresistor or photocell, is a type of resistor whose resistance decreases with increasing incident light intensity. This change in resistance is due to the interaction of light photons with the semiconductor material within the LDR. When exposed to light, more photons are absorbed by the semiconductor, … Read more
In electronic circuits, it is common practice to earth (ground) one of the two plates of a capacitor for several reasons. One primary reason is to establish a stable reference point for voltage levels within the circuit. By grounding one plate of the capacitor, this plate is connected to the earth potential, which is typically … Read more
In a capacitor, the steady state current refers to the condition where the rate of change of charge on the capacitor plates becomes zero over time. This means that once the capacitor is fully charged (or discharged), the current flowing into or out of the capacitor ceases to exist. In other words, the steady state … Read more
A bias resistor in electronics is used to establish a specific operating point, or bias point, for active components such as transistors or operational amplifiers within a circuit. The resistor is typically connected to the base or gate of a transistor or the input of an operational amplifier to set the DC voltage level at … Read more
Resistors resist electricity or current flow through the principle of resistivity, which is an intrinsic property of the material from which they are made. When current flows through a resistor, the electrons collide with atoms in the resistor material, resulting in a transfer of energy. This interaction impedes the flow of electrons and converts electrical … Read more
Variable resistors, also known as potentiometers or rheostats, have various uses across different applications. One common use for a variable resistor is in electronic circuits where precise control over resistance is necessary. They are often employed to adjust the voltage levels in a circuit, thereby controlling the amount of current flowing through specific components. This … Read more