Download 8.1 Reading Notes

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8.1 Reading Notes
Electric and
Magnetic Forces
All matter has _________________________ and
___________________ properties because the atoms that make
up matter are held together by ___________________________
forces.
Magnetic forces can ____________ or __________ because
there are two kinds of magnetic poles, called __________ and
_________.
A north pole ____________ another north pole but
_____________ a south pole.
Charges
Like magnetism, electric charge comes in two types. We call
them _______________ and __________________.
A positive charge attracts a ________________ charge and vice
versa.
Two similar charges _____________ each other.
Electric Charge
Inside atoms found in matter, attraction between positive and
negative charges holds the __________ together.
Because ordinary matter has a zero overall charge, most matter
acts as if there is no electric charge at all.
A tiny imbalance in either _____________ or ______________
charge is the cause of _____________ ___________________
Electric Current
Electric current is caused by moving _______________ charge.
Electric current comes from the _____________ of electric
charges.
These charges are called ___________________.
Electric current is similar in some ways to a current of
______________.
Like electric current, water current can carry ______________
and do _______________.
Electric Current
A waterwheel turns when a current of water exerts a force on it.
_______________ ____________ is what makes an electric
motor turn or an electric stove heat up.
Electric current is measured in _____________ in honor of
Andre-Marie Ampere.
Electric current can carry a great deal of _____________.
An electric motor the size of a basketball can do as much work
as _________ horses or ___________ strong people.
Voltage
No current flows when there is _______________ voltage
difference, which is why a dead battery won’t light a bulb.
Current flows from ____________ voltages to _________
voltage.
It is the ____________________ in _________________ that
makes electrical current flow just as a difference in height
makes water flow.
Batteries
A battery uses stored __________________ energy to create a
__________________ difference.
An electrical ________________ carries energy to electrical
devices.
Electric current flows from __________________ to
____________________.
Batteries create different voltage differences, so they can be
“stacked up” to make _________________ voltages.