Magnetism And Electromagnetism Flashcards
What are the two poles ?
North and south
where is the magnetic field strongest ?
Near the poles
What type of force is magnetism non contact or contact ?
Non contact
How do you increase an electro magnet ?
Increase current
Increase turns
What happens when a current flows through a wire ?
A magnetic field is created around it
Where is the magnetic field greater ?
Closer to the wire
Increased current
What is a solenoid ?
Coiled up wire
What’s an solenoid with an iron core called ?
Electromagnet
What does an electromagnet consist of ?
Solenoid ( coil of wire )
Iron core
Current
What are electromagnets used for ?
Door bells
Scrapyard cranes
What is the motor effect explanation ?
wire carrying a current creates a magnetic field. This can interact with another magnetic field, causing a force that pushes the wire at right angles. This is called the motor effec
How do you remember Fleming left hand rule ?
M F C
Movement
Field
Current
What’s Fleming left hand rule used for ?
The direction of a motor effect
What do the transformers do ?
a step-up transformer increases the voltage
a step-down transformer reduces the voltage
What is a transformer ?
A device that can change voltage
