3-Sensing Flashcards
What are ions?
Electrically charged atoms or molecules in which the number of electrons is different to the number of protons.
List 2 materials where ions make up the structure:
- Metals
- Ionic compounds
What produces an electric current?
A flow of charged particles
What is electric charge measured in?
Coulombs (C)
What is the equation of charge?
Current X Time
What is the total charge flowing across a section?
Charge X Amount of electrons
What is current measured in?
Amperes (A)
What is Kirchhoff’s first law?
Current at a junction must add up
When current divides at a junction, what must happen?
It must add up.
What is 1 Amp equivelant to?
1 coulomb per second
What does the total charge into a junction equal?
The total charge out of the junction.
What is the potential difference between 2 points?
The potential energy difference for every unit of charge
What is the equation of work done?
Charge X Voltage
What is dissipation
When energy is ‘wasted’
When calculating the amount of energy dissipated in a given amount of time, what 4 equations do you have to use?
Charge = Current X Time Work done (energy dissipated) = Charge X P.D or Power = Current X P.D Power = WD /time
What is power?
The amount of energy transferred in a given amount of time
What is the equation of power?
Energy transferred / Time
What is the 2nd equation of power?
Power = Current X Voltage
What is the 3rd equation of power?
Power =Current^2 X Resistance
What is the equation of conductance?
Current / Voltage
What is Conductance measured in?
Siemens
What is the equation of Resistance?
Voltage / Current
What is resistance measured in?
Ohms
What is 1/Resistance equal to?
Conductance