L Theory Flashcards
What is current?
Current is the flow of electrons past a point in one second
1Amp = 6.241x10^18 electrons per second
What are the 6 methods of producing a voltage?
- chemical
- friction
- induction
- heat
- light
- pressure
For potential difference to exist between two points a circuit must have a ?
A difference in charge.
what is potential difference measured in?
Volts(V)
what force is used to push voltage around a circuit?
Electromotive Force
To produce a voltage chemically, what must the plates be made of?
Dissimilar metals.
what are the 3 requirements for inducing a voltage?
- a conductor
- a magnetic field
- relative movement
what determines the polarity of a induced voltage?
The direction of movement between the conductor and magnetic field.
what 2 things determines the voltage produced by a thermocouple?
1.types of materials used
2.diffrence in temp at both ends
what is the name of the materials used in solar panels?
Semiconductors
what materials produce voltage when pressure is applied?
piezo quartz crystal
what is the circuit symbol for current?
I for intensity
what is current measured in?
Amps(A) or Ampere
what is the outer orbit of a atom called?
Valance shell.
what is the outer electron called?
Valance electron
what is the polarity of a electron?
negative
what is the name of the electron that is released form a atom?
free electron.
what is the name of a atom that that has released a electron?
Positive ion
what is stated in ohms law?
That a current flowing through a conductor, is directly proportional to the applied voltage across it, providing that the temperature remains constant, and is inversely proportional to the resistance.
what is the formula for ohms law?
Voltage(v)=Current(I)×Resistance(R)
what is a series circuit and its main down fall?
A circuit where two or more components are connected end to end.
downfall: one component fails the circuit is broken
how do you find the resistance of a series circuit?
add all of the resistances up
Rt = R1+R2+R3
don’t forget your units ohms(Ω)
what happens to current and voltage in a series circuit
currant stays constant and voltage changes
what is a parallel circuit?
all of the components are connected side by side said to be parallel to each other