Electricity Flashcards
what happens to the current in a series circuit?
it stays the same
what happens to the potential difference in series circuit?
the sum of all the voltages across each component is the total voltage across the cell/ battery
what happens to the current in a parallel circuit?
the current will split depending on the resistance of each branch but the current that leaves the cell or battery is the same as the current returning back into it
what happens to the potential difference/voltage in a parallel circuit?
the voltage across the cell/battery is the same as the voltage across each branch
what does the resistance do in a series circuit?
the total resistance is equal to the sum of all the resistors in the circuit
what does the resistance do in parallel circuit?
the total resistance of two resistors is less than the smallest resistor
where do electrons flow from?
positive to negative
which is used up in an electrical circuit the current of potential difference?
potential difference
what is Ohms law?
the current flowing through a wire is proportional to the potential difference across it as long as the the mperature remains constant
what is current?
the flow of electrons
what is conventional current?
the flow of electrons from negative to positive
how could you prove the rule for potential difference in a parallel circuit?
——V—–
l l
_________________cell________________
l l
l l
l l
l l
l l
__________bulb_________bulb________
l l l l
—–V—– —–V—–
why does resistance change with the length of the wire?z
its much easier for electrons to pass through ashorter wire than a longer one
what are the current, voltage graphs for a filament lamp, ohmic conductor and a diode?
what are some factors affecting resistance and why?
the temperature,length and cross-section
temperature-the temperature means the metal ions have more kinetic energy so vibrate more and the electrons collide more so theres more resistance
length - its harder for the electrons to pass through
cross sectional area-the smaller the cross sectional area the greater the resistance as less electrons can move through at once. these electrons will move at the same speed as those moving through a bigger cross sectional area
is a diode ohmic or non ohmic?
non ohmic as in the current voltage graph the line is not straight
