Circuit Symbols Flashcards
diode
only allows current to pass through in one direction
variable resistor
a resistor whose resistance can be varied, increasing the resistance decreases the current
AC supply
alternating current, current flows one way, then the other
push switch (open)
no current flows until push switch is pushed
has never been spotted in a paper
milliammeter
(a sensitive ammeter, which measures in milliamps)
relay
an electromagnetic switch
has never been spotted in a paper
microphone
converts sound energy to electrical energy
has never been spotted in a paper
thermistor
resistance changes with temperature, cold = high resistance, can be used as a temperature sensor
cell
converts chemical energy to electrical energy
resistor
reduces the current flowing
light emitting diode (LED)
a diode that emits light, only allows current to pass through in one direction
push switch (closed)
switch is pushed, current can flow
has never been spotted in a paper
lamp
converts electrical energy to light (and heat too)
electric bell
ding ding
has never been spotted in a paper
fuse
safety device, thin wire melts when current is too high, breaks circuit
motor
converts electrical energy to kinetic energy
closed switch
current can flow, circuit is complete
battery
two or more cells connected
transformer
can increase or decrease AC voltage/current
often labelled when seen in a paper
heater
heats things, converts electrical energy to thermal energy
has never been spotted in a paper
light dependent resistor (LDR)
resistance changes with light intensity, dark = high resistance, can be used as a light sensor
open switch
current can’t flow, circuit is broken
generator
converts kinetic energy to electrical energy
has never been spotted in a paper
ammeter
measures current, placed in series
DC supply
direct current, current flows from positive to negative
voltmeter
measures voltage, placed in parallel across the component to be measured
Earth
safety feature, allows charge to flow away safely
has never been spotted in a paper
