Resistor- If the voltage across an element is linearly proportional to the current flowing through it than the element called is a resistor.
A Resistance can be described as that property of circuit element which offers opposition to the flow of current.
It converts the electrical energy into heat energy.
Ohm's Law- It states that at constant temperature the current density is directly proportional to the electric field intensity.
At constant temperature the potential difference across an element.
For the ohm's law to be valid temperature and the conductivity of material should be constant.
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