The Motor Effect and DC Electric Motors

Question

Answer

What do motors convert electrical energy into?

What does a current carrying conductor produce around it?

A force is placed on specific objects when they enter an external magnetic field. What must these objects be?

What is this effect called?

What equation do you use to calculate this force if the object is perpendicular to the external magnetic field?

What is the magnitude of the force when the object is parallel to the external magnetic field?

Two parallel current-carrying conductors _______ each other if their direction is the same.

Two parallel current-carrying conductors _____ each other if their direction is opposite.

The magnetic field strength of a magnetic field emitted from a current-carrying conductor can be calculated using what equation?

What does the constant k in the above equation equal to?

If two current-carrying conductors experience a force from each other, the equation to find out this force can be obtained by equating the above two equations to form a new equation. This equation is F=______/_. (Consider the two currents to be i1 and i2)

Torque, T, is the _______ effect of a force acting on an object.

It is easier to rotate an object when the force is applied _______ ____ from the pivot axis..

It is also easier to apply the force if the force is applied at _____ ______ to a line joining the pivot axis to its point of application.

Using the above two statements, what is the equation to calculate torque (assuming T is torque) (when refrencing the angle just write (angle))

What is the SI unit for torque?

A simple DC motor usually consists of three parts and a source of current. What are these three parts?

What is the name for the frame that the coil rotates with?

In the initial force equation for the motor effect, what does the n represent?

What do AC split ring commutators do every half turn?

The commutator ^ every time torque almost reaches what?

Other than the split-ring, what are the other parts of the commutator (they are conducting contacts between the DC source and the split-ring)

The brushes also stop the connecting wires from getting _______.

Other than increasing the variables or using more coils, what is a way to increase the torque produced from a motor?

To maximise torque, what must be done to any permanent magnets?

What are two common examples of DC motors?