Ch.20 Test Flashcards
What is the SI unit of electric charge
The coulomb (C)
In excess or shortage of electric produces a?
Net electric charge
Force of attraction or repulsion between electrically charged objects
Electric force
The effect and electric charge has on charges surrounding
Electric field
Like charges blank and opposite charges blank
Repel/attract
The strength of an electric field depends on what
The amount of charge that produces the field and the distance from the charge
Study of the behavior of electric charges
Static electricity
How can static electricity be transferred
By friction contact or induction
Occurs when a pathway through which charges can move forms suddenly
Static discharge
The continuous flow of electric charge
Electric current
What does electric current need
A complete loop and source of electrical energy
Unit of electric current
A
Unit of voltage
V
Unit of resistance
(Symbol)
Unit of electric charge
C
What is the SI unit for electric current
Amp
What are the two types of current
Alternating current
And
Direct current
Flow of charge regularly reverses its direction
Alternating current
Charge flows only in one direction
Direct current
Material through which charge cannot flow easily
Electrical Insulator
Material through which charge can flow easily
Electrical conductor
Wood plastic rubber and air are all examples of
Electrical insulators
Metal and copper are all examples of
Electrical conductor
Opposition to the flow of charge is in a material
Resistance
What three things is resistance affected by
Length thickness and temperature
Is less resistance favored or unfavored
Less resistance is favored
Voltage is aka
Potential difference
Difference in electrical potential energy between two places in a field
Potential difference
Source of electrical energy
Voltage
What is the SI unit for voltage
Volt
Complete path through which charge flows
Electric circuit
Circuit diagrams use what to represent parts of circuit to show source of electrical energy
Symbols
A circuit can either be
Open or closed
In this type Of circuit the current flows in a complete loop
Closed circuit
In this type of circuit the current stops in an incomplete Loop
Open circuit
An example of turning lights off is what type of circuit
Open circuit
And example of turning lights on is what type of circuit
Closed circuit
In a series circuit how many paths does the charge have
One
In a parallel circuit how many paths does the charge have
More than one path
Current is the flow of
Positive charges
Charge flows from
Positive to negative
In a parallel circuit what happens if one part stops
It can still operate
In a series circuit what happens if one part stops
Nothing can operate
A property that causes subatomic particles such as protons and electrons to attract or repel each other
Electric charge
Rate at which energy is converted to another form of energy
Electrical power
P= i x v; what does everything stand for
P= watts
I=amps
V=volts
E= p x t; what does everything stand for
E= electrical energy
P=power
T=time
This electrical safety device melts if there is too much current
Fuse
This electrical safety device is a third prong and the exes charge travel to the ground
Grounding
This electrical safety device is a switch that opens when there’s too much current
Circuit breaker
What does ohms law state
Voltage equals current times resistance
Insulation prevents what
Short circuits
What does the law of conservation of charge state
States that the total charge in an isolated system is constant
