Current

• Current: a flow of charge, the SI unit is the Ampere (A).
• An ammeter measures the current in a circuit and is connected in series
• Current is a rate of flow of charge.
• In metals, current is caused by a flow of electrons
• The formula for current is: $Current\ \left(A\right)\ =$$\ \frac{Ch\arg e\ \left(C\right)}{Time\ \left(s\right)}$ or $I\ =$$\ \frac{Q}{t}$
• Current follows path of least resistance
• Conventional current flows in the direction opposite to that which electrons flow in.
• Red = Conventional Current

  Green = flow of electrons

  
• The charge of 1 electron: $1\overline{e}\ \ =$$1.6\times10^{-19}C$
• 1 Coulomb: $1C=$$6.25\times10^{18}e$