PHYSICS MAGNETIC FEILDS AND CIRCUTS Flashcards
Coulomb’s Law
the force between two point charges is proportional to the product of their charges and inversely proportional to the square of their separation
current (I)
rate of flow of electric charge
drift velocity
the speed at which electrons move due to the current
electric field
a region of space where a charged object experiences a force due to its charge
electric field strength (E)
the force per unit charge experienced by a small positive test charge placed in the field
electronvolt (eV)
the energy an electron would gain by being accelerated by a potential difference of 1 volt
emf
energy supplied per unit charge
internal resistance
the resistance of the components of the cell itself that leads to energy loss in the cell
Kirchhoff’s Current Law
at any junction in a circuit, the total current entering the junction equals the total current leaving
Kirchhoff’s Voltage Law
around any closed path of a circuit, the total of all the potential differences (ΔV) is zero.
light dependent resistor
a resistor whose resistance increases as light intensity decreases
Ohm’s Law
the current flowing through a piece of metal is proportional to the potential difference across it providing the temperature remains constant
potential difference (V)
the work done (or energy transferred) (W) when one unit of charge (q) moves between two points
primary cell
an electric cell that cannot be recharged
resistance (R)
the ratio of potential difference across the component to current flowing through the component
