Electric Charges
What is the SI unit of current?
ampere
material through which current does not easily flow
insulator
What is a device that transforms the energy of an electric current into another useful form of energy?
Load
What is the region of concentrated magnetism at the end of a magnet?
pole
An electric field with equal strength throughout is called
Uniform field
A proton gives off what type of charge?
positive
material that allows current to flow through it with no resistance
superconductor
What process imparts electric charge at a distance without direct contact?
induction
The imaginary line that circle Earth halfway between two magnetic poles
magnetic equator
The Earth's "north-seeking" pole is called
The south magnetic pole
electrical device designed to hinder current flow
resistor
A device that opens or closes a circuit?
switch
A substance that has several unpaired electrons per atom and is strongly attracted to magnets
ferromagnetic
What are used to indicate the direction and strength of a magnetic field?
lines of flux
The SI unit of resistance?
Ohm
material through which current flows easily
conductor
What device uses a narrow strip of metal to prevent excessive current through a circuit?
fuse
The force that causes an electric charge moving through a magnetic field to deviate form its original path
deflecting force
What happens to the total current flowing in a parallel circuit when more branches are added?
the total current increases
The SI unit of electric charge
coulomb
neither a good conductor or a good insulator
semiconductor
A circuit that contains a complete path for electrons to flow through is called
closed circuit
A material whose domains strongly resist changes in the direction of its magnetic field is described as magnetically _?_.
soft
What value equals the product of voltage and current in an electric current?
power