chapter 19 study guide Flashcards
i hate ms henshaw
why are atoms considered to be electrically neutral?
atoms have equal numbers of protons and electrons
when will two objects attract each other?
opposite charges attract
a material through which electrons do not readily flow
insulator
when does an electric field get stronger?
when it gets closer to a charge
list one good example of a good conductor
copper
why is copper used in household wiring?
low resistance
which of the following has the least resistance: a short, thick metal wire or a long, narrow wire?
a thick copper wire has less electrical resistance than a thin copper wire of the same length
resistance is measured in what unit?
ohm
a path created for a current that only allows one route
series circuit
a device designed to open an overloaded circuit and prevent overheating
circuit breaker
a circuit that has two or more seperate paths for electros to follow
parallel circuit
a material through which electrons can easily move
conductor
list three examples of an insulator
rubber, glass, wood
an atom has an equal number of protons and
electrons
the process of providing a path to drain excess charge into Earth
grounding
be able to identify the equation for ohm’s law
voltage=current x resistance
if the distance between two charged objects increases, what happens to the electrical force between them?
it decreases
when an object has more negative charge than positive charge
static charge
lightning is an example of electrical
discharge
if a current in a portable radio is 0.4 amperes, and the resistance of the circuit is 30 ohms, what is the voltage provided by the radio’s battery?
v=0.4x30.0=12 volts
list some facts about the forces between charged objects
negative and positive objects attract. both negative or both positive will repel each other
list one real-life example of a series circuit
a string of holiday lights
what would a GFCI protect you from?
electric shock
a simple circuit containing a light switch in the on position
closed
what happens to positive and negative charges during a lightning strike?
negative charges build up at bottom of a cloud. positive charges build up on the ground. negative charges flow to the ground.
classify metal and why its important in a wire
conductor; carries electricity
classify plastic and why its important in a wire
insulator; protects current wire from shocking
