What is a device that uses electricity and magnetism to create motion?
Answer: A device that uses electricity and magnetism to create motion is called a motor .
What is the major similarity between a galvanometer and a simple electric motor?
Galvanometers and electric motors are both based on the same basic principle of an external magnetic field exerting a force on a current carrying wire. The difference is in how far the device is allowed to move. supposed to move a little bit, usually against a restraining spring.
What is the purpose of a commutator in an electric motor?
On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.
Which portion of an electric motor rotates in the presence of the magnetic field?
commutator
How does a motor work in a circuit?
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor’s shaft.
What job does a cell or battery do in a circuit?
Essentials. A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.
How does a cell act like a capacitor?
A cell’s capacitance determines how quickly the membrane potential can respond to a change in current. A capacitor is made up of two conducting materials separated by an insulator — in the case of a cell, the extracellular and intracellular fluids are the conductors, and the lipid membrane is the insulator.
How is capacitance related to speed?
As explained by the answers there, the reason saltatory conduction in myelinated neurons is faster than non-myelinated conduction is because the capacitance of the membrane is lowered by reducing the number of channels (Channel density) or equivalently, increasing the spacing between channels.