Chapter 4- Quiz A Flashcards
Magnetic flux is:
a.) curved lines of force in space
b.) magnetic material
c.) the magnetization of other materials
d.) groups of smaller magnets
a.) curved lines of force in space
An adjustable form of a resistor is the:
a.) capacitor
b.) switch
c.) rheostat
d.) diode
c.) rheostat
When a switch is closed, electric current _________ when a switch is opened, electric current _________.
a.) stops, turns to AC
b.) stops, flows
c.) becomes AC, becomes DC
d.) flows, stops
d.) flows, stops
A transformer is constructed with 100 turns on the primary side and 10 turns on the secondary side. What type of transformer is this?
a.) step down transformer
b.) step up transformer
a.) step down transformer
The removal of electrons from an object by rubbing it with another is electrification by:
a.) friction
b.) grounding
c.) induction
d.) contact
a.) friction
If two magnets are brought together, north to north poles will _________ whereas north to south poles will __________
a.) attract, repel
b.) attract, attract
c.) repel, repel
d.) repel, attract
d.) repel, attract
Electrostatics is also known as electricity
a.) true
b.) false
b.) false
There are _________ pounds in 1 kg.
a.) 2.5
b.) 2.2
c.) 3.2
d.) 1.2
b.) 2.2
The purpose of grounding is to:
a.) ensure constant voltage
b.) provide a source for electricity
c.) neutralize a charged object
d.) replace the circuit breaker
c.) neutralize a charged object
A transformer with a greater number of wire turns on the primary side compared to the secondary side would be considered an:
a.) step down transformer
b.) autotransformer
c.) step up transformer
a.) step down transformer
The experimental link connecting electric and magnetic forces was discovered by:
a.) faraday
b.) oersted
c.) lenz
d.) volta
b.) oersted
1 kilohertz is equal to
1000 hertz
The ability to do work because of a seperation of charges is:
a.) electrostatics
b.) electric potential
c.) resistance
d.) electric current
b.) electric potential
The shift of electrons from one object to another without being in contact with each other is electrification by:
a.) grounding
b.) contact
c.) induction
d.) friction
c.) induction
Which of the following would likely be classified as a ferromagnetic material?
a.) iron
b.) air
c.) lead
d.) water
a.) iron
A diode allows electrons to flow in only one direction.
a.) true
b.) false
a.) true
Which of the following conditions or envirometns will provide the least resistance?
a.) a large cross sectional area
b.) long conductor
c.) high temp conductor
d.) glass material
a.) a large crosss sectional area
The resistance of electric flow through a circuit is measured in:
a.) joules
b.) volts
c.) amperes
d.) ohms
d.) ohms
Circuit overloads occuring in sensitive components of an electrical circuit can be prevented by the use of which of the following devices?
a.) thermionic diodes
b.) fuses
c.) circuit breakers
B and C
A material that ahs a large number of free electrons is a :
a.) good insulator
b.) good conductor
c.) poor conductor
d.) none of the above
b.) good conductor
Which of the following is a method of electrification?
a.) difraction
b.) resonance
c.) induction
d.) excitation
c.) induction
Nearly all discussion of electricity deals with the movement of:
a.) negative charge
b.) poitive charge
c.) neutral charge
d.) all of the above
a.) negative charge
Device that increases or decreases voltage through EM induction
transformer
Device that converts electrical energy to mechanical energy through EM induction
electrical motor
a device that converts mechanical energy to electrical energy
generator
a wire that melts if it recieves too much current
fuse
device that inhibits the flow of electrons
resistor
a one way valve that allows electrons to flow in only one direction
diode
stores and electrical charge temporarily but cannot produce new electrons
capacitor
produces electrons through a chemical reaction, stores electrical charge long term, and provides an electrical potential
battery
