How the electric motor works

Cards (3)

What does an electric motor do
Use electricity to create rotational motion
This is because a coil of wire carrying a current, placed in a magnetic field, rotates due to the motor effect
How does a split ring commentator ensure the coil rotates in one direction
Swaps the positive and negative connections every half turn, meaning the direction of the current through the could reverses every half turn
This means that the forces acting on the coil will always be acting in the same direction
This causes the coil to rotate continuously in one direction
4 ways to increase the speed of rotation in an electric motor
Increase the current in the coil
Add more turns to the coil
Use stronger magnets
Add a soft iron core to the coil