Magnetism
how many poles do all magnets have
two
a device used to detect and measure small electric currents
galvanometer
in a series circuit,all devices receive the same
voltage
like charges ____
unlike charges_____
repel & attract
A dc battery provides
potential energy
the strength of the magnet field of a horseshoe magnet is:
greatest near the poles of the magnet
A material that is a good electrical insulator is :
a poor conductor
an electrical device that can control the flow of current in an electrical circuit is called a(n)
resistor
what is the force between two electrons?
repulsive
a direct current (dc) battery converts
chemical energy into electrical energy
how many poles do magnets have?
two
what unit of electrical energy is sold by electric companies?
kilowatt-hour
what can iron filings be used to show?
magnetic field
what property does earth have that causes grounding to drain static charges?
it is a conductor
When a current- carrying wire is wrapped around an iron core, what can it create?
a magnet
Why does the needle of a compass point to magnetic north?
The compass needle aligns itself with Earth's magnetic field
an object that is positively charged
has more protons than electrons
which energy transformation occurs in an electric motor?
electrical to kinetic
what does a transformer between utility wires and your house do?
decrease voltage
Which energy transformation occurs in an electrical generator?
electrical to kinetic
what prevents most charged particles from the Sun from hitting Earth?
Earth's magnetic field
as more devices are added to a series circuit what happens to the current?
decreases
what prevents most charged particles from the Sun from hitting earth?
Earth's magnetic field
which of these objects do magnetic fields NOT interact with?
paper
Which energy transformation occurs in an electric generator?
electrical to kinetic