Electromagnets Flashcards
Things needed to make an electromagnet
Coil of wire A.c power supply Connecting wires Switch Soft iron rod
How to control the strength of an electromagnet?
Increase the turns in the coil or increase the current through the wire
Magnetic field directions do strength
The direction of the magnetic field depends on the direction of the current
the strength of the magnetic field depends on the size of the electrical current (amps)
How an electrical bell works
The switch turns on-electricity through the circuit-current through coil of wire-becomes a magnet and attracts armature- moves towards the electromagnet-hits the gong-sound.
Armature moved-gap between the contacts-curren can’t flow-electromagnet is magnetic- aromatherapy springs back- armature swings back and forwards- bell, keeps ringing- someone has their finger on switch
Electrical relay circuit
Current passed through low/coil relay circuit
Magnetic field is produced in the coil
The pivoted armature is attracted to the coil
Contacts pushed together
Currents passed through the motor circuit (high current)
Another word for coil of wire
Solenoid
Why would still be bad for the core of an electromagnet?
Steel would stay magnetised when the current was switched off, so you wouldn’t be able to turn of the the electromagnet
