Electricty Flashcards
(11 cards)
Current
Rate of flow of charge
Electromotive force (EMF)
total energy supplied per coulomb charge by the cell
Potential difference
Work done per unit charge
Ohm’s Law
Current through a conductor is directly proportional to the potential
difference across the conductor at constant temperature.
Resistance
Material’s opposition to the flow of electric charge.
Conventional current
Flow of positive charge from the positive pole of the cell,
through the circuit, to the negative pole of the cell.
Electron flow
The flow of electrons through the circuit from the negative pole of the
cell to the positive pole of the cell.
What is in a simple circuit
Closed unit
Battery
End user (ex. Light bulb)
Why do batteries go flat
(3)
A battery or cell supplies electric potential energy to the circuit.
Chemical potential energy is transferred to electric potential energy through
chemical reactions which occur inside the battery or cell.
When all the chemical potential energy has been transferred to circuit components, like light bulbs and
resistors the battery is no longer able to supply current
Current is ….. to resistance
Inversely proportional
Factors affecting resistance
(4)
Type of material
Temperature of conductor
Length of conductor
Diameter of conductor
