B5 - Current and Circuits

Electric circuit

systems where electric charge flow through a close loops 

Electric current (I)

the rate in which electric flow through a conductor

Direct current (DC)

current that carrier flow in a single direction 

Electric potential difference (V)

energy per unit charge to move a positive charge between 2 points 

Power dissipated

rate in which energy is transferred

Resistance (R)

a measure how much material oppose the flow of electric current

Resistivity

a material property that quantify how strongly it resist the flow of electric current 

Ohm Law

stated that current through a conductor is directly proportional to the potential difference 

Ohmic material

material that obey the Ohm law, will have a constant resistance 

Variable resistor

components that allow you to adjust the resistance in a circuit.

Internal Resistance (r)

resistance within the battery that are caused by the materials and the chemical reaction inside it

Electromotive force (emf)

work done per unit charge to move a charge around a circuit