How is resistance and current related?
Ohm’s law defines the relationship between the voltage, current, and resistance in an electric circuit: i = v/r. The current is directly proportional to the voltage and inversely proportional to the resistance.
Where do we use resistance?
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
What is difference between resistance and resistor?
Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it. A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc.
Why is resistance important in a circuit?
Electrical resistance is one of the key attributes in an electrical circuit – it determines the current flowing for a given voltage.
Is resistance good or bad for a circuit?
Resistance can be both good and bad. If we are trying to transmit electricity efficiently from one place to another through a conductor, resistance is undesirable in the conductor. Resistance causes some of the electrical energy to turn into heat so some electrical energy is lost along the way.
What is the need for resistance?
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits.
What is the physical significance of the resistance?
The collisions of electrons with other atoms and electrons is the reason for the resistance in the path of current inside a conductor. With the increase in temperature the time between successive collisions decreases hence the drift speed decreases and we say that Resistance increases.