Physics Unit 2 Flashcards
The process where electrons are removed or added to a body of matter, is called
Electrification
The electrostatic force between two charges is____ proportional to the square of the distance between them
Indirectly
What device can detect the presence of an electrical charge?
Electroscope
Electrostatics is the branch of physics dealing with charges____
At rest
A____ charged object has an excess of electrons
Negatively
The removal of electrons from one object, by rubbing it with another of a different kind is called electrification by____
Friction
When a charged body touches an uncharged body, the uncharged body acquired the same charge, and is called electrification by____
Contact
Electrical charges
On the external surface of a conductor
The greatest concentration of charges will
Reside on the sharpest, external curvature of a conductor
If you increase the charges of two negatively charged objects, the electrostatic force between them____
Increases
The process of electrification, when electrical field act upon one another, without touching is known as
Induction
T/F electrification by induction is the simplest method of electrification
False
T/F in order for electrons to flow. There must be equal charges at both ends of the pathway.
False
T/F super conductors, have the ability to conduct or insulate electron flow
False
T/F Electrons in an electrical current always move in the same direction
False
T/F electrostatics is also called static electricity
True
T/F titanium is an example of a non-conductor
False
T/F if an object has a deficiency of electrons it has a positive charge
True
T/F the longer the conductor, the less resistance it has to electric current
False
T/F the unit of resistance is Ohms
True
T/F if you increase the temperature of a conductor, you decrease resistance
False
T/F if a circuit is open, current will not flow
True
Which method of electrification is of most important to the radiographer
Induction
In solid conductors,_____ charges are stationary
Positive
Which of the following statements is true regarding electrolysis
Electrolysis is the electron movement through an ionic solution
The device that converts chemical energy to electrical energy is known as a
Battery
The device that converts mechanical energy to electrical energy is known as a
Generator
______ is termed as the quantity of electrons flowing
Current
_____ is termed for the number of electrons in excess, at one end of the circuit and a deficiency at the other
Potential difference
_____ is termed for the strength or force of electron flow
Potential difference
_____ is termed for the opposition to current flow in a circuit
Resistance
Potential difference
Volt
Current
Ampere
Resistance
Ohms
Power
Watt
As the cross-sectional diameter of a conductor increases resistance will
Decrease
In a conductor as temperature increases, resistance_____
Increases
Series
Has one complete pathway for current flow, current is the same for each component, current stops with any break
Parallel
Current for each resistor may differ, adding resistors, reduce resistance, break in one branch, has no effect on others
Circuit breakers are sometimes used to decrease the occurrence of a short circuit because of an increase in____
Amperage
Which end of the pole is the source of electrons?
Negative pole
What term is used to describe the maximum potential difference between positive and negative ends of a source
EMF
T/F Creating a pathway for electrons to move between a charge body in the Earth is called grounding
True
