Transcript Electricity Review Questions

Electricity Review
Questions
How are charges transferred
through conduction?
By Direct Contact
How are charges transferred
through induction?
Charges in an uncharged metal object are
rearranged without direct contact with a
charged object.
How are charges transferred
through friction?
Electrons are “wiped” from one object onto
another.
What is voltage?
Voltage is a measure of how much work is
needed to move a charge between two
points.
What is current?
The amount of electricity flowing through a
circuit.
What is resistance?
Resistance is the opposition presented to
the current by a material or device. Will
allow charges to flow, but they do not
flow freely.
What is the relationship between
current and resistance?
Resistance increases, Current decreases
Resistance decreases, Current increases
What is the relationship between
voltage and current?
Voltage increases, Current increases
Voltage decreases, Current decreases
What are the three parts of an
electric circuit?
Wire, Load, Energy Source
What is electric discharge?
The release of electricity stored in a source.
What is static electricity?
Electric charge at rest. Examples: charged
balloon, clothes stuck together from dryer
What is a conductor?
A material in which charges can move freely.
What is an insulator?
A material in which charges cannot move.
Examples of conductors and
insulators:

Conductors: Iron, copper and other
metals, water

Insulators: Glass, Wood, Plastic, Cotton
What is a resistor?
An object that supplies resistance in an
electrical circuit.
What is an electric field?
The space around a charged object in which
another charged object experiences an
electric force.
What is a fuse?
A thin strip of metal that melts when too
much current is flowing through it, creating
an incomplete circuit.
What is a circuit breaker?
A switch that automatically opens if the
current is too high.
How can you increase the
magnetic field in an electromagnet
or solenoid?
Add more coils of wire or increase current.
What is a series circuit?
A circuit in which the
parts are joined one
after another so that
the electricity has only
one pathway.
What is a parallel circuit?
A circuit in which the
parts are joined in
branches, giving
electricity more than
one pathway.
What are some advantages of a
parallel circuit?
If one load is missing or broken, charges will
still flow through the other branches. You
can use one light or appliance at a time.
What types of circuits are used
most often in homes?
Parallel
What does a wire carrying electric
current produce?
A magnetic field
What is a solenoid?
A coil of wire with an electric current in it.
What is an electromagnet?
A coil of wire that has an iron core and acts
as a magnet when an electric current is in
the coil.
How do you make magnets using
electricity?
Make a coil of wire and send a current
through it.
How do you make electricity using
a magnet?
Move a magnet in and out of a coil of wire,
or spin a coil of wire inside a magnet.
What are some ways
electromagnetism is used in our
daily lives?
Electric Motors, Cars, Generators,
Doorbells, Computers, Computer disks,
Headphones, Cell Phones, Satellites,
Television, Audio Recoding Devices,
Speakers, Video Cassettes, Microphones
What are four electrical safety tips?




Make sure the insulation on cords is not worn.
Do not overload circuits by plugging in too many
electrical devices.
Do not use electrical devices while your hands
are wet or while you are standing in water.
Never put objects other than a plug into an
electrical outlet.