Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

What is a Variable Resistor?Variable resistor definitionResistor whose resistance can be adjusted as needed. It is a common component in electronic circuits that allows current or voltage to be adjusted according to Ohm's law.Basic structure of variable resistorA variable resistor usually has three terminals: two fixed terminals at the end of the resistance track and one removable terminal (cursor). Depending on how the terminals are connected to the circuit, a variable resistor can be used as a

What is an Electrical Resistor?A resistor is a passive component in a circuit which provides resistance to the flow of current. There are many different types of resistors. These resistors vary in their construction, power dissipation capacities, and tolerance to various parameters (such as temperature and light). The types of resistors include: Carbon Composition Resistor Thermistor Wire Wound Resistor Metal Film Resistor Carbon Film Resistor Variable Resistor Varistor Light Dependent Resistor

What is a Bleeder Resistor?A bleeder resistor is a standard resistor connected in parallel with the output of a high-voltage power supply circuit for the purpose of discharging the electric charge stored in the power supply’s filter capacitors when the equipment is turned OFF. This is done for safety reasons.If someone accidentally touches during the service of equipment in the OFF state, there may be a chance to get shocked even if the device is in OFF condition. Hence, it is necessary to disch

What is a Ballast Resistor?A ballast resistor is defined as a resistor inserted into a circuit to minimize current. Ballast resistors also help to avoid over-current faults in a circuit. An “electric ballast” is a more general term used to refer to an electrical device used to maintain a circuit’s stability by limiting the value of current and voltage. Electric ballasts can be resistors, capacitors, inductors, or a combination of these.Ballast resistors are able to change resistance with the cur

What is an Electrical Resistor?A resistor (also known as an electrical resistor) is defined as a two-terminal passive electrical element that provides electrical resistance to current flow. Resistance is a measure of the opposition to the flow of current in a resistor. The larger a resistor’s resistance, the greater the barrier against the flow of current. There are many different types of resistors, such as a thermistor.In an electrical and electronic circuit, the primary function of a resistor

What is a Shunt Resistor?A shunt resistor (or shunt) is defined as a device that creates a low resistance path to force most of the electric current through the circuit to flow through this path. In most cases, a shunt resistor is made up of a material having a low-temperature coefficient of resistance, giving it a very low resistance over a wide temperature range.Shunt resistors are commonly used in current measuring devices called “ammeters”. In an ammeter, the shunt resistance is connected in

What is a Pull-Down Resistor?A pull-down resistor is used in electronic logic circuits to ensure a known state for a signal. It is usually used in combination with transistors and switches to ensure the voltage between ground and Vcc is actively controlled when the switch is open (similar to a pull-up resistor).This can sound confusing at first, so let’s go into an example.A digital circuit has three input logic states; High (1), Low (0), and floating (undefined). But the digital circuit only op

What is a Pull-up Resistor?A pull-up resistor is used in electronic logic circuits to ensure a known state for a signal. It is usually used in combination with transistors and switches to ensure the voltage between ground and Vcc is actively controlled when the switch is open (similar to a pull-down resistor).It is not a special kind of resistor, it is a normally fixed value resistor connected between a supply voltage and input pin.This can sound confusing at first, so let’s go into an example.D

A carbon composition resistor is a type of fixed resistor that limits or reduces the electric current in a circuit. It is made of a solid cylindrical body of carbon or graphite powder mixed with a binder, such as clay or resin. The carbon powder acts as a conductor, while the binder acts as an insulator. The resistor has two metal leads or caps attached to its ends, which connect it to the circuit. Carbon composition resistors were widely used in the past, but they are now replaced by other type

What is a Light Dependent Resistor?A light-dependent resistor is defined as a device whose resistance decreases with increasing light intensity and increases with decreasing light intensity. The resistance of an LDR can range from a few ohms to several megaohms, depending on the type and quality of the material used and the ambient temperature.The symbol for a light-dependent resistor is shown below. The arrow indicates the direction of light falling on it. How Does a Light-Dependent Resistor W