Is resistance a frictional force?

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω).

What is an electrical resistance?

The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is electrical conductance, measuring the ease with which an electric current passes.

Does electricity have friction?

Friction is seldom used for producing electrical energy. When a person with a negative static charge contacts an object with a positive static charge, all of the excess electrons flow (jump) to the object. All methods of electrification require electrons to move from one body to another.

What causes electrical resistance?

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. The relationship between resistance and wire length is proportional .

What is the relationship between resistance and conductivity?

While a conductors resistance gives the amount of opposition it offers to the flow of electric current, the conductance of a conductor indicates the ease by which it allows electric current to flow.

Does resistance slow down current?

Resistors are electrical components in an electric circuit that slow down current in the circuit. Even the filament from an incandescent light bulb is effectively a resistor, slowing down the current and heating up a wire to a high enough temperature that it gives off light.

How does electrical resistance arise in metal conductors?

Resistance is due to the collision of free electrons with the metal ions of the conductor. When the temperture increases, the metal ions have more energy and vibrate. This increases the frequency of collisions between free electrons and the metal ions, and therefore increasing the resistance.

What is the difference between resistance and resistivity of a conductor?

Resistance is defined as the property of the conductor which opposes the flow of electric current. Resistivity is defined as the resistance offered by the material per unit length for unit cross-section. The SI unit of resistivity is Ohm.

What happens if there is no resistance in a circuit?

If there really were no resistance in the circuit, the electrons would go around the circuit, and arrive back at the beginning of the circuit with as much energy as the potential difference (the voltage). That final energy is usually what is dissipated as heat or other types of energy by the circuit.

How do you get rid of electrical resistance?

To reduce resistance increase its cross section, make it shorter and reduce its temperature or change to a material that has a lower resistivity if you can. Some metals will become super conductors at temperatures near absolute zero.

What is the difference between resistance and friction?

Resistance is similar to friction for electrical energy; resistance causes the electrical energy to be lost as heat (thermal energy), just like friction causes mechanical energy to be lost as heat.

What is the definition of friction in physics?

Friction is a resistance against the movement of an object as a result of its contact with another object. This means that when you rubbed the plastic comb along your hair, your hair resisted the movement of the comb and slowed it down. The friction between two surfaces can cause electrons to be transferred from one surface to the other.

What is the relationship between resistance and energy?

Resistance is similar to friction for electrical energy; resistance causes the electrical energy to be lost as heat (thermal energy), just like friction causes mechanical energy to be lost as heat. Resistance is a measure of how much voltage an electrical element needs in order to increase the electric current.

Is it accurate to separate the electrical resistance of a motor?

And yes, as illogical as it may seem, it is accurate to separate the electrical (resistance) from the electro-mechanical (motor/generator) portions of the motor in this manner. It is, however, still a bit oversimplified if you are doing actual motor control electronics.