On a microscopic level,
electrons moving through the conductor collide (or interact) with the particles of which the conductor (metal) is made
. When they collide, they transfer kinetic energy. The electrons therefore lose kinetic energy and slow down. This leads to resistance.
What causes resistance simple?
Due to collision or obstruction,
the rate of flow of electrons or electric current is restricted
. Hence, we can say that there is some opposition to the flow of electrons or current. Thus, this opposition offered by a substance to the flow of electric current is called resistance.
What is the cause of resistance?
Resistance is caused
in a conductor by the free electrons
. These free electrons collide with each other and with the ions and atoms that oppose their free movement. This obstruction is known as resistance.
What are the factors affecting resistance class 12?
- The temperature of the conductor.
- The cross-sectional area of the conductor.
- Length of the conductor.
- Nature of the material of the conductor.
What causes resistance class 10?
Resistance – Higher tier. An electric current flows when electrons move through a conductor, such as a metal wire.
The moving electrons can collide with the ions in the metal
. This makes it more difficult for the current to flow, and causes resistance.
What are the 4 factors that affect resistance?
- The type of material of which the resistor is made.
- The length of the resistor.
- The thickness of the resistor.
- The temperature of the conductor.
Which is directly proportional to the resistance?
The resistance of any conductor is directly proportional
to length
and inversely proportional to area of cross-section of the substance. As value of resistance(R) is directly proportional to length of resistance, so by increasing the length of resistance the value of resistance increases.
What is a good resistance reading?
It automatically subtracts test lead resistance—typically 0.2 Ω to 0.5 Ω. Ideally, if test leads touch (are shorted together), the display should show
0 Ω
. … Read the measurement on the display.
What happens when the resistance increases?
When resistance is increased in a circuit , for example by adding more electrical components ,
the current decreases as a result
.
Why do you need resistance in a circuit?
The main function of resistors in a circuit is
to control the flow of current to other components
. Take an LED (light) for example. If too much current flows through an LED it is destroyed. So a resistor is used to limit the current.
What are the two factors that influence resistance?
Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are
Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material
.
What affects a material’s resistance?
How much resistance a material has depends on several factors:
the type of material, its width, its length, and its temperature
. All materials have some resistance, but certain materials resist the flow of electric current more or less than other materials do. … A longer wire has more resistance than a shorter wire.
Will current flow more easily through a thick or thin wire?
The current will flow more easily through the
thick wire than the thin wire
. It is because the resistance of a conductor is inversely proportional to its area of cross-section. If the thicker the wire, the less is resistance and hence more easily the current flows.
For a conductor material, the resistance of the material is inversely proportional to the area of cross-section and directly proportional to the length of the conductor. Relation between Resistivity and Resistance is:
R=ρlA
, where ρ is the resistivity, l is the length of the conductor and A is the cross sectional area.
Does resistance depend on length?
The resistance of a wire is
directly proportional to its length
and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor.
Does resistance depend on temperature?
Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself,
the resistance depends on temperature
. With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.
