Resistor

Resistors are truly ubiquitous. The only passive component in electronic circuits that dissipate energy is Resistor.

Resistor: It is a passive electronic component. What it does is it obstructs the current passing through it. A resistor is just like a wall. Based on the resistance value, it allows some portion of current/large currents through it.

The property of obstruction/ opposing the flow of electrons is called Resistivity and the amount of opposing can be judged by parameter Resistance. And it’s units are Ohms (Ω). It is represented by letter ‘R’. Below is the circuit symbol of resistance.


Resistors can also be defined as “Component that has Electric Friction”. Resistors are temperature dependent i.e., few resistors’ resistance value varies with a change in temperature.
Resistors can be subclassified as shown below:
Carbon and Wirewound resistors have their resistance values fixed. Whereas Potentiometers and Rheostats can be varied for a higher range of resistance up to Mega Ohms(MΩ). Thermistors and Varistors are temperature variant resistors whose resistance varies with respect to temperature. Below are the resistors that are available in the market.



Also, Most of the electronic component works under the principle of Ohm’s law. The resistance value is also dependant on Ohm's law.

Ohm’s law: It states that under constant temperature, Current (I) flowing through a material is directly proportional to Voltage applied (V).

We can also define it as “Current flowing through a conductor is varied in proportional to voltage applied (Ideally). Now there’s nothing ideal. Hence, the current flowing through a conductor is opposed by resistance when the voltage is applied.


The above picture shows "Ohm's triangle" where we can understand the relationship between Voltage, Current and Resistance.

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