module 12 Flashcards
Who was the inventor of the electric generator and electric transformer?
Michael Farady
Like charges _____________ one another.
repel
Opposite charges ____________one another
attract
What is a fundamental force in nature that acts between charged particles and is the combination of all electrical and magnetic forces?
Electromagnetic force. It can attract or repel.
Name the 3 principles regarding gravitational force.
- all electrical charges attract or repel one another, depending on whether they have opposite charges or similar charges.
- the force between charged objects is directly proportional to the amount of electrical charge on each object.
- The force between charged objects is inversely proportional to the square of the distance between the two objects.
What are photons?
photons are small packages of light that act just like small particles.
Electrical force is inversely proportional to _________________________
the square of the distance between them.
When an atom looses electrons, what do we call it?
a positively charged ion
When an atom gains electrons, what do we call it?
a negatively charged ion
What is one way atoms gain or loose electrons?
through chemical reactions
What is is called when you charge an object by allowing it to come into contact with an object which has already has an electrical charge?
charging by conduction
What is called when you charge an object by forcing some of the charges to leave the object?
charging by induction
The number of electrons the flow through a circuit in a given amount of time is called __________________
the electrical current.
electrical current is usually measured in ____
Amps.
What is a Volt?
unit of electromotive force, the difference of potential that would drive one ampere of current against one ohm resistance.
Describe conventional current.
Current that flows from the positive side of the battery to the negative side.
What is the measure of how much a metal impedes the flow of electrons?
resistance.
A circuit that does not have a complete connection between the two sides of the battery is called_______.
an open circuit
When devices are connected to the same source, but can work independently of each other, this is called ___________________.
a parallel circuit.
All magnetic force results from __________________.
The flow of charged particles.
The two side of a magnet are called________________.
The north and south poles of a magnet.
_________magnetic poles repel one another, while _________magnetic poles attract one another.
Like; opposite.
Magnets are called _________because magnetic pols always come in pairs.
dipoles
Scientists are looking for a pole isolated by itself, called a _____________.
monopole.
What is a magnetic field?
The force between the poles of a magnet.
