physics quiz 7?

• Current - the movement of charge, or the rate at which charge flows
• What are the units for current?

  Amps or C/s
• Conventional current - the direction that a positive charge would flow
• Negative charges move in the direction opposite to the electric flow, sometimes called electronic flow
• Drift velocity - average velocity of the free charges
• The current that flows through most substances is directly proportional to the voltage applied to it
• Resistance - the electric property that impedes current
• Resistance units?

  Ohms
• The only substances that obey Ohm's law are called ohmic
• the resistivity of all materials depends on temperature
• direct current - the flow of electric charge in only one direction
• alternating current - the flow of electric charge that periodically reverses direction
• when the peaks and troughs line up, the current and voltage are said to be in phase