Resistors

Role of Resistors in Circuit

Electrical resistance is the barrier or opposition to the flow of electrons in a particular medium say's copper wire. An electrical component that provides electrical resistance is called resistor. Passive Devices are all called as resistor. The Purpose of resistor is to reduce the voltage signal or current signal passing through them in a circuit. Mostly resistor are linear devices that produce a voltage drop across themselves whenever a flow of electric current through them because resistor obey ohm's law (V = I / R). There are different values of resistors that can be used according to a particular needs say's 10Ω, 100Ω and so on. Resistors are mainly used to provide a specific voltage for an active devices say's transistor. Some of the most commonly used resistors are

• Carbon Resistor
• Film Type Resistor
• Wirewound Resistor

Series Resistor in Electrical Circuit

When two are more resistance are connected in series across the supply, there will be only one path for the flow of current in the circuit. Then the total Resistance R_t are increased. The Voltage across the resistors connected in series will be different, but the current in the circuit will remains the same. Hence it is called as voltage dividing network. when R₁ R₂ R₃ be the resistors connected in series. Then the total resistance R_t becomes R_t = R₁ + R₂ + R₃.

Parallel Resistor in Electrical Circuit

When two are more resistance are connected in parallel across the supply, by connecting their terminals together, Then the total Resistance R_t decreased drastically. The current through the resistors connected in parallel will be different, but the voltage remains the same. Hence it is called as current dividing network. when R₁ R₂ R₃ be the resistors connected in parallel. Then the total resistance R_t becomes 1/R_t = 1/R₁ + 1/R₂ + 1/R₃.