Electricity and Charge Vocabulary
Terms in this set (44)
the accumulation of access electric charge
Law of Conservation of Charge
A charge can be transferred from one object to another but cannot be created or destroyed.
material,such as copper wiire, in which electrons can move easily
material in which heat flows slowly
Charging by contact
process of transferring a charge
Charging by induction
process of rearranging electrons
the net movement of electric charges
related to the force that causes electric charges to flow
closed conducting loop
tendency for a material to oppose electron flow
states that the current in a circuit equals the voltage difference divided by the resistance
circuit in which electric current has only one path to follow
circuit in which electric current has more than one path to follow
A small piece of metal that melts if the current becomes too high. When it melts, it causes a break in the circuit, stopping the flow of current.
contains a piece of metal that bends when the current in it is so large that it gets hot. The bending causes a switch to flip and open the circuit, stopping the flow of current.
rate at whichelectrical energy is converted to another form of energy.
V = I x R
The first recorded references to static electricity and lightning were made over 2,500 years ago by
The static charge that develops when certain materials are rubbed against amber.
Difference between a conductor and an insulator in terms of electrons.
conductors have free electrons, and insulators don't
Name four metallic conductors.
silver, gold, aluminum, copper
5 common materials that are insulators
glass, plastic,rubber, air, wood
The movement of electrons between atoms is called an
What unit measures the flow of electron?
The energy produced as a result of this flow of electrons from atom to atom is called
How is an amp defined?
current when 1 coulomb of electrons moves past a point in 1 sec.
What is a coulomb?
unit of charge
What unit measures the flow of electrons?
What is the force that causes electrons to move in an electrical circuit?
Name 3 sources of EMF.
battery, generator, photocell
What happens to the electron flow within a conductor if the EMF or voltage source is removed?
stops flowing, no current
What unit is used to measure EMF?
What is a volt?
electrostatic difference between 2 points
What is resistance?
force that opposes current
In what units is resistance measured?
Define the term ohm.
resistance on 1 amp @ 1 volt
State one example when resistance is desirable.
when you want shielded from electricity
State one example when resistance is undesirable?
when we are transmitting electricity
What components are placed in an electrical circuit to control the amount of resistance in circuit?
In 1827, George Ohm developed a mathematical relationship between voltage, current, and resistance called
State Ohm's Law in a mathematical equation.
V = IR
How is a circuit formed?
connect components with wires (form a loop)