Electricity and Circuits Flashcards
An electric field is a force field caused by?
Charges
Electric force and gravitational force are alike in that both forces
are field forces
Objects become electrically charged as a result of the transfer of
electrons
Which type of force is responsible for holding electrons in orbit around the nucleus of an atom?
electromagnetic force
If two objects are electrically repelled from each other and one is negative what could the other object be?
negative
If two objects are electrically repelled from each other and one is positive what could the other object be?
positive
The term used to describe electrical pressure is __________.
voltage
When there is an electric current passing through a wire, the particles moving are _________.
electrons
A voltage will influence current only if the circuit is __________.
closed
current
amperes
voltage
volts
resistance
ohms
charge
coloumbs
Substances whose atoms have more free electrons are called ________.
conductors
_________ are materials that do not allow electricity to pass through them so easily.
insulators
Electric current in a wire is the
rate at which electric charges move through a wire.
A voltage will influence current only if the circuit is __________.
closed
In order for there to be a flow of charge from one place to another, there must be a
complete conducting path connecting two terminals
What is Ohm’s Law?
V=IR
voltage is the
potential difference between two points in a circuit.
Power outlets in our homes generally have a potential difference of
120 V
squiggly line
AC
dotted/straight line
DC
A Battery makes this type of current.
DC
A generator makes this type of current.
AC
AC flows
back and forth
DC flows
in one direction
Electrical resistance in a wire depends on the wire’s
all of these (temp, length, thickness)
________ is the rate at which energy is transferred from one from to another.
power
Which statement is correct regarding electric power.
Electric power = current x potential difference
The mechanism of a complete circuit that converts electrical energy to other forms of energy is
electrical load
If the voltage impressed across a circuit is constant but the resistance doubles, what change occurs in the circuit?
Current is reduced by half.
Electrical resistance is measured in
ohms
Is electrical resistance greater in a short thick wire or a long thin wire?
long thin
Which of the following is a unit of power?
joule per second
A circuit breaker is designed to limit the amount of ____________ in a circuit.
current
Three lamps are arranged as shown above. Which single lamp must burn out to cause all of the lamps to go out?
lamp 2
What arrangement would make the brightest light?
2 bulbs connected in parallel with 2 batteries
What happens when one light goes out or is removed in a series circuit?
All the lights go out
Which type of circuit is characterized by the fact that there are multiple pathways by which charge can travel?
parallel
What happens when one light goes out or is removed in a parallel circuit?
Only that light goes out
Several resistors are wired in a circuit so that there is a single path for the flow of electric current. What type of circuit is this?
series
A short circuit is
potentially hazardous, a circuit without a load that presents little resistance to electron flow
Which of the schematics shown above conducts electricity through the lamp?
A and C
What can you say about the voltages in a parallel circuit?
It is the same across each branch as the supply voltage
Because household devices are connected in parallel in a circuit, ____________ as new devices are connected.
the potential difference (voltage) remains the same in each branch
