electricity and magnetism Flashcards
Electric current is the flow of
electric charges
Explain the law of charges.
Unlike charges attract each other while like charges repel each other.
the buildup of electric charges on an object. An example is a balloon rubbing on hair, causing it to stand up.
static electricity
3 ways that electric charges can be transferred from one object to another.
friction, conduction, induction
electrical charges within an object are rearranged when an electrically charged object is brought close
induction
electrons are transferred from direct contact
conduction
electrons rubbed off on one another
friction
the pressure that creates force (push) to cause electrons to flow
voltage
measuring unit of voltage
amperage
Matter that electricity will flow through easily is called a
conductor
Matter that electricity will not flow through is called a
insulator
The opposition to the flow of electric current is called
resistance
A thicker wire would have
lower resistance than a thin wire
The longer a wire, the
greater the resistance
A complete closed path that electrons can travel through is called a
circuit
When all parts of a circuit are connected in a single loop, it is called a
series circuit
When a circuit contains many branches for the electricity to travel. It is called a
parrallel circuit
What part of a magnet exerts the greatest magnetic force?
the poles
Name the 3 elements that magnets can be made of.
iron, nickel, colbalt
Tiny regions that line up resulting in a magnetic force are
magnetic domain
How do permanent magnets differ from temporary magnets?
Permanent magnets differ from temporary magnets because they are made from materials that are hard to magnetize but retain better. Temporary magnets are easily magnetized but don’t last long. Permanent magnets are always magnetic and temporary magnets need to be created to be magnetized.
How is an electromagnet created? What are the different parts of an electromagnet?
An electromagnet is created with solenoid and an iron core. The solenoid is the coil used to wrap around the core so electricity can run through it and align the domains of the iron core.
