Electrical Stuff Flashcards
Surplus of electrons?
Negatively charged
Three electrical quantities?
Voltage
Current
Resistance
What is voltage?
Difference in charge between 2 points.
Measurement of potential difference.
What is current?
Rate of flow of electric charge in a body.
What is resistance?
Materials tendency to resist the flow of charge.
Components in a circuit m, allow us to?
Control the charge.
Three material properties?
Insulators
Semiconductors
Conductors
5 conductor examples?
Gold Silver Zinc Magnesium Copper Iron Aluminium
What happens to charged electrons in a vacuum?
Uninhibited
Lethal DC voltage?
50v
Lethal AC voltage?
30v
What does static electricity require?
Separation of positive and negative charges.
What is charge?
Displacement of electrons produce electrical charges, more electrons at one point and a lack at another.
What is a Coulomb?
Unit of electric charge
Quantity of electricity transported in one second by a current of one ampere.
What is potential difference?
State of charge of one body relative to another.
Measured in volts
Define current?
Flow of electrons
Unit ampere
Measured using ammeter
Conventional current?
Flow from positive to negative
Electron flow
Out of negative into the positive
How are ammeters placed?
Series
What is resistance?
Opposition to current flow.
What is electromotive force?
When a source of electrical energy with a potential difference can maintain a continuous flow. Volts
Electrical power?
Rate of energy dissipation in electrical power
What is ohms law?
V
I R
Electrons in a direct current flow in?
One direction
What current do batteries use?
DC
What is a period
Time taken for one cycle
Frequency is the number of cycles completed in?
1 second
