Ch. 10 Flashcards
Two objects will attract each other electrically only if
One is positive and one is negative
Which of the following could not happen when two charged objects touch each other?
Several seconds pass and then the objects fly apart
An electrical charge is usually produced by the removed or addition of
Electrons
Lines of force represent election fields through their
Direction
Closeness
Charging an object without actually adding or removing electrons is called
Electrical induction
A mechanical electro scope cannot detect
A small charge
Which of the following is a conductor?
Gold
Which of the falling is a insulator?
Rubber
Capacitors contain
Insulators only
What part of a circuit is designed to turn electricity into another form of energy
Electrical load
Conventional current
Is the opposite the flow of electrons in a conductor
The unit for potential difference is
Volt
Which part of a circuit in a home is designed to be replaced if it stops a circuit overload?
Fuse
What is the major difference between static and current electricity?
Static is stationary electricity
Current is moving electricity
What force causes the leaves in an electroscope to repel each other?
Electrostatic force
What is the SI unit for electrical charge?
Coulomb
What is the net charge of a dipole?
Zero
Descibe how materials are classified in terms of conductivity
Conductors
Insulators
Semiconductors
Why does lightening flow through a lightening rod instead of the building it is mounted on?
The wire to the ground is a better conductor than the building itself.
Give two practical applications of static electricity
Photo copier
Electrostatic precipitator
Describe the movement of electrons through a circuit
Negative to positive
What is the difference between how a batter and a generator work?
Batteries are limited sources of electrons. Generators are machines that use the special relationship between electrical and magnetic energy to move electrons through conductors.
How does a photovoltaic cell work?
?
If a lamp in your house no longer works, and you notice that is has frayed wire, then it probably has developed what?
Short circuit
Neutrons do not contribute to electrical charge.
True
Most obstacles have an equal number of protons and electrons.
True
Lines of electrical force indicate the direction an electron travels if subjected to the field represented.
False
Electrical induction does not produce a charged object.
True
Static cling is worse in the summer than in winter because summer air is moister and contains more ions.
False
An electroscope’s leaves separate because they have opposite charges.
False
Lightening is an example of an electrical discharge.
True
Current can run through only solids, such as electrical wires.
False
Direct current is the primary energy source is portable electronic devices.
True
A light switch is an example of an electrical switch.
True
Photovoltaic cells and electrochemical cells convert the same type of energy to electricity.
False
If a Christmas light strand has one built break and all the bulbs go dark, it is most likely wired in a series circuit.
True
The ideal circuit arrangement for a household would be a series circuit.
False
What summarizes that like charges repel and unlike charges attract?
Law of charges
What consists of one or more electrochemical cells that supply electrons released by a chemical reaction?
Battery
What instrument detects the presence of charges?
Electroscopes
What are modern charge-storage devices called?
Capacitor
What is a special device that changes the voltage within portions of a circuit?
Resistor
