physics circuit and current review

Conventional current

Current in the direction in which a positive charge would move

Generators

Convert mechanical energy to electric energy

Circuits

Convert electric energy to heat/light

A Charge moves through a circuit,

Resistors cause drop in POTENTIAL energy

Ampere is equal to

1 Coulomb per second

How do u find power? LIST ALL FORMULA

P=IV, P=I²R, P= V²/R —> IN CIRCUIT SPECIFICALLY

Ohms law states…

The ratio of Potential difference to current is a constant for a given conductor ANY RESISTANCE that does not change with TEMP, VOLTAGE, OR DIRECTION OF CHARGE FLOW obeys the law

Circuit current

can be controlled by changing voltage, resistance or both

If power is dissipated at a UNIFORM RATE…

The thermal energy converted equals power multiplied by time

ENERGY EQUALS….(FORMULA FORM)

E=Pt, E=I²Rt, V²/R • t

Superconductors are…

Materials with zero resistance, their usage right now is limited

Joule heating loss..

Electric energy turned into thermal energy (I²R) loss, to minimize, keep current in wires low. + Higher voltages, current reduced without loss of power

kilowatt-hour….

Equal 3.6×10^6J

Current in a simple series circuit is…

The same EVERYWHERE (I- VALUE)

Req =

=Sum of all resistances

Current in a SERIES CIRCUIT…

I=V from source/R

Sum of the voltage drops across resistors in a series