ohms, circuits, power Flashcards
factors that can change current intensity
nature of wire: copper is faster
diameter of wire: thicker is faster
length of wire: shorter faster
temperature:colder is faster
resistance: more slower
The current intensity
the amount of charge that flows through a point of an electrical circuit in one second.
The potential difference
the amount of energy provided by the power supply (battery). It is the energy transferred by electrons between two points of an electrical circuit. (Imagine the amount of push needed to get a car on a racetrack from point A to point B.)
The resistance
It is the ability of a material to resist the flow of electric charges.
ohm law
v=ir
Electrical circuits transform electrical energy into other forms of usable energy. examples
light, heat, sound, mechanical energy etc.
function of power supply
power supply: creates a potential differance
function of wires
conduction:connect circuit components to power supply
function of resistor, light, motor
electrical resistance:;imit flow electrons
function of switch
control: allow control of current by connecting or breaking circuit
ammeter
measure current flowing through circuit
voltmeter
measures potential difference between two points of a circuit
series circuit
In a series circuit, elements are linked directly together (connected end to end). All charges follow the same pathway. If a part of the circuit is open or an element is defective, the current stops flowing through the entire circuit.
parallel circuit
A parallel circuit branches out at least at one point. The charges follow different pathways. If part of one pathway or branch in a parallel circuit is open or an element is defective, the current continues to flow through the other branches.
direct current
Electrons continuously move in the same direction.
