Chapter 7 Review
What is the standard voltage per branch in a home in the US
120V
Which of the following wires has the lowest resistance
A short thick copper wire at 25C
The outlets in your home provide
AC (alternating current)
What is static electricity
An electrical charge at rest
converts chemical energy into electrical energy.
Cell
What is the difference between friction, conduction and induction?
Conduction objects have to touch for electrical charges to switch, induction do not have to touch but have to be close to make the charges switch friction is when two objects rub and stick together
What is the electric power equation
E=P*T
Is the rate at which electrical energy is converted into other forms of energy
Electrical Power
Which of these letters is used to represent current in equations
I
Two objects repel each other. What charges might the objects have?
Positive Positive or negative negative
Which letter is used to represent resistance in equations
R
Is the opposition to the current by a material
Resistance
What is the difference between a series and parallel circuit?
Series all connected in one loop Parallel more than one loop or branches
Each load in a circuit has the same current
Series circuit
What happens to electric current if voltage becomes larger
The current increases
What is current electricity
The rate at which charges pass a given point; moving charges
Which letter is used to represent voltage in equations
V
What are the two types of electric current
alternating and direct
Which of the following is the unit for electrical current
amps or amperes
What do you call the tiny particles that make up matter
atoms
This changes chemical or radiant energy into electrical energy
cell
Which device converts chemical energy into electrical energy
cell
in electricity, a device that produces an electric current by converting chemical or radiant energy into electrical energy
cell
This happens when electrons move by direct contact
conduction
Which of the following is a good conductor
copper
Which of the following is a complete, closed path through which electric charges flow
electric circuit
the rate at which charges pass through a given point; measured in amperes
electric current
the release of electricity stored in a source
electric discharge
the space around a charged object in which another charged object experiences an electric force
electric field
the force of attraction or repulsion on a charged particle that is due to an electric field
electric force
Which of the following devices does not protect you from electrical fires
electric meter
the rate at which electrical energy is converted into other forms of energy
electric power
Charges flow easily in an
electrical conductor
Which of the following is a material in which charges move easily
electrical conductor
a material in which charges can move freely
electrical conductor
What is the rate at which charges pass a given point
electrical current
Lightning is a form of
electrical discharge
Which of the following is a material in which charges CANNOT move easily
electrical insulator
a material in which charges cannot move freely
electrical insulator
Which of the following is the rate at which electrical energy is changed into other forms of energy?
electrical power
This is the part of the cell through which charges enter and exit
electrode
This is a mixture of chemicals in a cell
electrolyte
An object becomes charged when the atoms in the object gain or lose
electrons
Atoms are made up of protons, neutrons and
electrons
Which of the following is not a basic part of a circuit
force
This happens when electrons are wiped from one object to another
friction
Which of the following is a good insulator
glass
For a cell to produce a current, the electrodes of the cell must
have a potential difference
This happens when charges in an uncharged metal object are rearranged without direct contact with a charged object
induction
the law that states that like charges repel and opposite charges attract
law of electric charges
Which of the following is connected to the energy source by wires and changes electrical energy into other forms of energy
load
a circuit in which the parts are joined in branches such that the potential difference across each part is the same
parallel circuit
This converts light energy into electrical energy
photocell
a device that converts light energy into electrical energy
photocell
In the formula p=v* I, what does P stand for?
power
What is the opposition to the flow of electric charge called
resistance
in physical science, the opposition presented to the current by a material or device
resistance
a circuit in which the parts are joined one after another such that the current in each part is the same
series circuit
electric charge at rest; generally produced by friction or induction
static electricity
This conducts thermal energy into electrical energy
thermocouple
a device that converts thermal energy into electrical energy
thermocouple
What is the potential difference between two points in a circuit called
voltage
the potential difference or electromotive force, measured in volts; it represents the amount of work that moving an electric charge between two points would take
voltage
What is Ohm's law
voltage=current* resistance
