Unit 9 Flashcards
(25 cards)
What is needed for electricity to move through a circuit
A electrical source
What are the types of electrical sources that can be found in a circuit
Cells and generators
How does a cell deliver energy
It has a chemical reaction creating electricity
How does electricity flow through a circuit
Negative to positive poles
What triggers the chemical reaction inside of the cell
The cell has to be connnected to the circuit for the reaction to take place
What does the voltage tell us about the cell/battery
The amount of potential energy it has
What does the voltage do in a circuit
It moves charge through the circuit
What is current
It is the rate of charge
What is charge
Known to be what the current moves through the ciruit
What is the symbol for current
C
What is the symbol for potential difference
V
What is the unit for charge
Coulombs
What is resistance
It is the how a conductor can resist the flow of electrons
How does current move through a circuit when it has resistance
The voltage (potential difference) is used to push the current through the circuit
What happens to the voltage
It is lost or used up by the resistors of the circuit
What does the used electrical energy change to
Heat energy
Why does resistance generate heat in a electrical circuit
The resistance causes frictional heat
What does a resistor do
It controls the amount of current in a circuit
What is a variable resistor
A resistor that would allow varying amounts of current through
What is a diode
It is a type of resistor that controls the flow of current in a circuit
What is ohms law
Current is indirectly proportional to resistance
As resistance increases current
Decreases
What effects resistance in a circuit
Conductor length, thickness, temp and the material of the conductor as well as actual resistors
What is a series circuit
It is a circuit that allows flow of electricity only through one path
