2. Conduction of electricity Flashcards
What is the definition of current?
The rate of flow of charge (Q/t).
What is the unit of current?
The ampere or Cs-1.
What is the definition of voltage?
The joules per coulomb of charge (V=W/Q).
What does the area under a current-time graph represent?
Total charge (Q).
What is the difference between conventional current and electron flow?
Conventional current flows from positive to negative where electron flow is negative to positive.
How to calculate the number of electrons?
Total charge (Q) / charge on an electron
What is the charge on an electron?
1.60 x 10^-19
What does the gradient of a charge (Q) over time graph represent?
The current.
What is the definition of drift velocity?
The small mean velocity of electrons in a conductor due to an applied pd.
What does n represent in I=nAve?
The number of free electrons per unit volume.
How to work out power dissipated?
Work out power then times by time.
