Ohm's Law Flashcards
What does the Ohm’s law state?
It states that “ The current is directly proportional to the voltage, and has an indirectly proportional relationship with the resistance.
What is voltage?
The potential energy per unit of charge, unit is Joules per Coulomb
What is resistance?
How much charge flow is impeded, unit is ohm
What is current?
The amount of charge per unit of time, unit is Ampere, or charge/time.
Which way do electron and current flow?
Electrons flow from negative to positive terminal, current flows from the positive to the negative terminal.
What is an Ohmic material?
An Ohmic material maintains its constant resistance, regardless what voltage or current.
What factors affect a resistor’s resistance?
The length of the resistor
The cross sectional area of the resistor
The material of the resistor
What is the resistivity of a resistor?
The capability to not to let little charge flow through it.
What is the conductivity of a resistor?
The capability to let charge flow through it
What is the relationship between resistance, resistivity, length and the cross section area of a resistor? ( Hint: The “REPLA” formula).
The resistance of a resistor is directly proportional to its resistivity and length, while inversely proportional to its cross section area.
What is the relationship between resistivity and conductivity of a resistor?
It turns out to be that the resistivity of a resistor is inversely proportional to its conductivity, in other words, if the object is a good resistor, it’s a bad conductor, and vice versa.
