Studied by 19 people
Electric current
The rate of net flow of any electrically charged particles
Coulomb
Charge that passes when 1 ampere of current flows for 1 second
Potential difference
Energy transfered per unit charge transfered from electrical to other forms
Resistance
Ratio of the p.d. across the component to the current through it
Ohms law
For a metallic conductor the p.d across it is proportional to the current through it, when other physical conditions such as temperature are constant
Superconductor
Material that when below a critical temperature resistance is 0
Critical temperature (Tc)
Temperature where if below a material becomes superconducting
Resistivity
The extent to which a material opposes the flow of electric current through it.
The resistance(R) multiplied by cross sectional area (A) over the length of the wire (l)
Power
Rate of work done
Watt
Power when one joule is transferred in one second
Kirchhoffs first law
The sum of the currents entering a junction equals the sum of the currents leaving that junction
Kirchhoffs second law
In any closed loop the sum of the emf’s is equal to the sum of the potential difference drops in that loop
emf
Chemical energy converted to electrical energy per coulomb of charge when passing through a power supply
Internal resistance
Resistance of materials within battery
Terminal p.d
The electrical energy per unit charge delivered by the source to the external circuit
Volt
1 joule per coloumb
Ohm
1 volt per ampere
Note
Flashcard