Electric current: rate of flow of charge and I=Q/t

CURRENT

• What is electric current?
• -Rate of flow of charge.
• Which equation shows this definition?
• -I=Q/t
• Calculate the amount of charge that passes a point in a circuit in 30 seconds, if the current is 5A
• -Q=It. Q=5*30=150C.
• Hence Calculate the number of electrons that pass the point in this time. (e=1.6*10^-19)
• 150/1.6*10^-19= 9.38*10^20 electrons.
• Which direction are these electrons moving in, relative to the conventional current direction?
• Opposite- current is conventionally the flow of positive charge, but electrons are negatively charged.