Ch Electricity II. Electric Current Cell and Battery Potential Difference Current Resistance Ohm’s Law
A. Cell and Battery Cell a device that produces an electric current by converting chemical energy into electrical energy A cell conducts a current Battery made up of many cells and also converts chemical energy into electrical energy
C. Current Current flow of electrons through a conductor depends on # of electrons passing a point in a given time measured in amperes (A)
D. Resistance Resistance opposition to the flow of electrons electrical energy is converted to thermal energy & light measured in ohms ( ) Copper - low resistance Tungsten - high resistance
D. Resistance Resistance depends on… the conductor good conductors have low resistance wire thickness less resistance in thicker wires wire length less resistance in shorter wires temp - less resistance at low temps