Circuits
A circuit containing a gap that electrons cannot cross is a(n) _______________________ circuit.
Open
the SI unit of resistance
Ohm
This type of material allows electricity to flow through it with no resistance at all
superconductor
Any device used to open and close a circuit
switch
Allows communication over long distances using electromagnets
telegraph
The situation in which electricity takes a shortcut through the circuit
short circuit
SI unit of current flow
ampere (amp)
A material through which current does not easily flow
insulator
An electrical device designed to add resistance to a circuit
resistor
V= IR
True or False
True
voltage = amps x resistance
Automatic switch that opens a circuit when the current exceeds a predetermined amount
circuit breaker
This SI unit measures the "force" with which an electric current flows
Material through which current flows easily
conductor
A group of electrochemical cells connected as a single source of electricity
battery
In the formula P= VI, What does the P stand for?
Power (or watts)
Houses a small metal strip that breaks to halt excessive current
fuse
The "force" with which electricity flows
voltage
The amount that an object hinders electron flow
resistance
Converts pulses of electricity into sound waves
Loudspeaker
An electrical switch operated by an electromagnet
relay
What is the total voltage in an electric circuit?
A. highest voltage C. sum of individual voltages
B. product of individual voltages D. zero
C. Sum of individual voltages
The rate of charge flow
current
Electric current that flows in both directions
alternating current
Simple device that converts electricity into back-and-forth motion
solenoid
What unit do electric companies use to charge for electricity?
kilowatt-hour