Current, Voltage And Resistance Flashcards
What is the unit of measurement of charge and it’s symbol?
Coulomb; C
What is the symbol for electrical charge?
Q
What is the number of electrons for one unit of charge?
6.28 x 10^18
Describe static electricity
The buildup of charging an isolated object
Define electric current
The flow of charge
What is the symbol for electric current
I
What is the unit of measurement for electric current and at symbol?
Ampere; A
Describe conventional current flow?
Current flow from positive to negative
Define voltage
The potential energy difference between two points
What is the name of force that maintains a voltage?
Electromotive force
State an abbreviation for electromotive force.
emf
State the unit of measurement for voltage and it’s symbol
Volt; V
State the symbol used to represent source voltage
E
State the symbol used to represent voltage drop
V
List six methods of producing an electromotive force
- Magnetic
- Chemical
- Friction
- Heat
- Pressure
- Light
Define resistance
Resistance is the property of the material that opposes the flow of an electric current
Using Ohm’s law, what happens to current when the voltage is increased and the resistance is held constant
The current increases
Using Ohm’s law, what happens to current when the resistance is increased and the voltage is held constant
The current decreases
The flow of electrons from one point to another is caused by
A difference in charge between two points
An electric field is a force that exists between _____ charges
Different; opposite
When a potential difference exists across an open portion of a circuit, a
Current will not flow
The unit of measurement for an electric current is
Ampere
According to a fundamental law of electricity the current in a DC circuit is
Directly proportional to the voltage
The symbol used to represent resistance is
R
The circuit property that opposes a flow of current within a circuit is called
Resistance
The symbol used to represent the unit of measurement for potential difference across a resistive load is
V
The type of electricity produced by rubbing together to materials is called
Static
A generator is a device that uses the magnetic principle to produce electricity.
True or false
True
A coulomb is the measure of a certain number of
Electrons
A device that has the ability to maintain a difference in potential between two points of an electric circuit is said to develop a/an:
Electromotive force
