Intro to Resistors

~ Hello again learners, welcome back to HHG Inst. ßlog. Today we are going to learning about resistors, one of the most important components of any electrical circuit.Without wasting any time let's dive right in...

    What's a Resistor ?

 - A Resistor is an electrical device that resists the flow of current.

- It can be thought of as a current limiting device.

- The Standard International (SI) Unit for resistance is the Ohm(Ω). 1 Ω = 1 V/A. - Electrical Resistance is a material's opposition to the flow of electric current , measured in ohms.

- It can also be defined as a physical quantity that characterizes the property of a conductor to prevent the passage of electric current and is equal to the ratio of the voltage at the ends of the conductor to the currents flowing through it.

- A resistor is one of the most useful electrical components, it is very rare to see a working circuit without a resistor.It can be used to set an operating current for an electronic component such as an Integrated circuit to prevent the component from burning due to excess current passing through it.

- A combination of resistors is called a resistor network. depending on the complexity of the network a theorem such as Thevenin, Norton, Kirchhoff, etc. can be applied to determine the final output resistance of the network.

- Electronic circuits such as radio circuits, Television circuits, etc, contain many resistors. Understanding a resistor is important, being able to solve a resistor network is important in designing circuits. Sometimes a resistor is used to attenuate or reduce signal level, current flow, voltage level, etc.

- There are 2 main types of resistors namely :

a)Fixed resistors

b) Variable resistors                     

  FIXED RESISTORS.  

• Fixed resistors are discrete, their value is fixed.

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