P4- Electrical Circuits Flashcards
what is the memory hack to remember the electrical equations
Can Jake Very Well Afford Chocolate Since Jake Went Away Often
what do the letters in the memory hack stand for
C - Coulombs = Charge (Q)
J - Joules = Energy (E)
V - Volts = Potential Difference/Voltage (V)
W - Watts = Power (P)
S - Seconds = Time (t)
A - Amperes = Current (I)
O - Ohms = Resistance (R)
what are all the equations of electricity
E=QV P=IV Q=It E=Pt V=IR
what is static electricity
Static electricity = with two insulators
what happens when 2 insulators are rubbed together
When two insulators are rubbed together, electrons move from to another, causing both materials to become charged, and so the two materials attract each other
what happens to charged objects
Charged objects create electric fields around themself
when drawing lines of fields which way do the arrows face for positive and negative charged objects
For positively charged objects, the arrows point outwards
For negatively charged objects, the arrows point inwards
The arrows must be perpendicular to the surface it is coming out from
Try to keep the arrows the same length
what is the electrical symbol for a cell
line where the left one is taller than the right one
what is the electrical symbol for a open switch
disconnected line with 2 dots
what is the electrical symbol for a closed switch
connected line with 2 dots
what is the electrical symbol for a bulb
a circle with a ‘x’ in it
what is the electrical symbol for a diode
a circle with the next symbol in it
what is the electrical symbol for a LED
circle with the next symbol in it with 2 arrows pointing out (out for emitting)
what is the electrical symbol for a Ammeter
a circle with an ‘A’ in it
what is the electrical symbol for a Voltmeter
a circle with a ‘V’ in it
what is the electrical symbol for a fixed resistor
a rectangle
what is the electrical symbol for a variable resistor
a rectangle with a line going diagonally through it
what is the electrical symbol for a fuse
a rectangle with a line going horizontally through it
full form of amps
Amps = Amperes
what does a diode do
Diode = only allows current through in one direction - only allows current through when connected with its terminals in a particular place
what does LED stand for
LED = light-emitting diode
what does a resistor do
Resistor controls the size of the current (fixed resistor only has one current setting)
what does a variable resistor do
Variable resistor - you can change the current size
define current
Current = the rate of flow of charge
definition of potential difference
Potential difference of a component = the energy transferred to the component, or the work done on it by each coulomb that passes through it
what are the 4 things needed for a current to work
4 things needed for a circuit to work:
power source
component
complete loop
no short circuit
what is a short circuit and how does it happen
Short circuit = a connection in the circuit that should not be there - a wire is connecting two different parts of the circuit that should have two different potential differences. Having this abnormal connection results in too much current flowing through which leads to overheating and even fires
draw a graph for a filament light bulb
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draw graph for ohmic conductor
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draw graph for diode
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what does thermister mean
Thermistor = temperature dependent resistor
If temperature increases, its resistances decreases.
