electricty Flashcards
(29 cards)
flows in one direction for a time then changes direction
alternative current
quoted voltage and frequency
AC
constant value
DC
Vpeak=
√2 Vrms
what is the x-axis of the oscilloscope
time base setting
how to find frequency
count the number of square to complete one wave x the time base setting the f=1/T
series circuit: current, voltage, resistance
current is the same at all points
voltage is split across components
resistance is added together
parrallel circuit: current, voltage, resistance
current is split
voltage is the same in all points =to supply
resitance 1/Rt=1/R1+1/R2….
the opposition to current flow
resistance
greater resistance=
lower current
power (watts)
energy transferred per second
emf
the energy per unit charge that flows through the source
joules per coulomb
why is there internal resistance
due to the chemicals present in the battery
what is a short circuit
a circuit with no load resistance
what is the terminal potential difference
the voltage across the terminals of the battery
what are lost volts
the voltage lost when a current is drawn across the internal resistor
what is the Y intercept of a voltage current graph
emf
what is the gradient of a voltage current graph
internal resistance
what is the x intercept of a voltage current graph
short circuit current
what dos a capacitor do
stores charge and energy
the charge stored in the capacitor is
proportional to voltage and defined as the charge per unit voltage
1 farad=
1 coulomb per volt
when is the capacitor fully charged
when the voltage across it is equal to the supply
what is the current when a capacitor is fully charged
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