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What is the magnetic field around a wire or solenoid (coil)
Right hand thumb towards direction of current, other fingers circle to show direction
How do loud speakers work
An alternating current produces a changing magnetic field around the coil. This field interacts with the permanent magnets magnetic field which produces a force which cause is it to move up and down. This movement creates sounds
How do relays work
A current is flown through a coil and the magnetic field around a coil is used to attract a switch, causing it to pivot and close and allow a current to flow. When the stops flowing through the coil, the switch will open
How does a d.c motor work?
A current in a circuit is flown through a coil which produces a magnetic field which interacts with the permanent magnetic field, creating a force. This force turns the coil and core, and a split ring commutator is used to reverse the current every half turn to keep the direction of rotation the same
How do you increase turning effect?
increase the current
increase amount of turns on the coil
increase magnetic field strength
Note 
Flashcard (28)