What is Electrical Resistance? Definition and Unit of Resistance

Definition of Resistance Property of a substance to resist the flow of current through it, is called resistance. When a voltage is applied across a substance there will be an electric current through it. The applied voltage across the substance is directly proportional to the current through it. The constant of proportionality is resistance. Hence … Read more

Resistance Variation with Temperature

There are some materials mainly metals, such as silver, copper, aluminum, which have plenty of free electrons. Hence this type of materials can conduct current easily that means they are least resistive. But the resistivity of these materials is highly dependable upon their temperature. Generally metals offer more electrical resistance if temperature is increased. On … Read more

Resistivity Laws of Resistance and Unit of Resistivity

Resistivity or Coefficient of Resistance Resistivity or Coefficient of Resistance is a property of substance, due to which the substance offers opposition to the flow of current through it. Resistivity or Coefficient of Resistance of any substance can easily be calculated from the formula derived from Laws of Resistance. Laws of Resistance The resistance of … Read more

Resistances in Series and Resistances in Parallel

More than one electrical resistance can be connected either in series or in parallel in addition to that, more than two resistances can also be connected in combination of series and parallel both. Here we will discuss mainly about series and parallel combination. Resistances in Series Suppose you have three different types of resistors – … Read more

Temperature Coefficient of Resistance

As we discussed in the page under title resistance variation with temperature that electrical resistance of every substance changes with change in its temperature. Temperature coefficient of resistance is the measure of change in electrical resistance of any substance per degree of temperature change. Let us take a conductor having a resistance of R0 at … Read more