Electricity Flashcards
what does it mean is the charge is fast
there is a large electrical current
what carries the charge in metals and what is produced
the electrons which produce an electric current
ignore this card
what is current like in a series circuit
the same at all point
what is voltage like in a series circuit
it is shared between the components
advantages and disadvantages of series circuits
advantages - requires fewer wires
disadvantages - if a fault occurs the whole circuit stops working
what is current like in a parallel circuit
the loop adds up to the total current from the supply
what is voltage like in parallel circuits
the same across each loop
advantages and disadvantages of parallel circuits
advantages - each loop can be controlled seperatley and if one stops working the rest still work
disadvantages - they are more complicated to construct
how do you calculate the total resistance when the resistors are connected
adding the value of the individual resistors
what is current
the rate of flow of charge at a point in the circuit
how is current measured and where is it connected
with an ammeter in series
what is voltage
the amount of energy transferred between two points in a circuit
what is resistance
the opposition to the flow of current
what is resistance measured in
ohms
what would a graph look like for a resistor
straight through zero
what type of graph and what would a graph look like for a filament lamp and LED
current / voltage graph and it will be a curve
why is a resistor lamp a straight line through zero
current is directly proportional to voltage and resistance is constant
why is a filament lamp graph a curve
resistance increases as the voltage increases and then the lamp gets brightter and hotter and it is because the atoms and ions make it harder for the electrons to flow through
why is a LED graph a curve
resistance decreases as the voltage increases
it only allows current to flow in one direction