Electricity Flashcards
(51 cards)
Current is measured in
amps
Current is the
rate of flow of positive charge at a point
At a junction, current is
conserved
Current is measure with
an ammeter in series
In a metal, current flows via
electrons
In a liquid, current flows via
ions
Potential Difference is also known as
Voltage
Voltage is
work done per unit charge
Voltage is measured with
a voltmeter in parallel
Resistance is measured in
ohms
Ohmic conductors have
constant resistance
An example of an ohmic conductor is
a resistor
Non-ohmic conductors have
variable resistance
An example of a non-ohmic conductor is
a filament lamp
With a thermistor, resistance
decreases as temperature increases
With a Light Dependent Resistor (LDR), resistance
decreases as light intensity increases
Components in Series are
end to end
In a series circuit, current is
conserved
In a series circuit, voltage is
shared (this is governed by each component’s resistance)
In a series circuit, the total resistance is
the sum of the individual resistances
Components in parallel are
in separate branches
In a parallel circuit current is
shared between brances
In a parallel circuit voltage is
the same across each branch
Parallel circuits are advantageous because
faults are isolated
