Physics P.5 Flashcards
Conductors
They conduct electricity very well. Let electrons pass through them
Insulators
Electrons don’t pass through because there’s is no delocalized electron i.e plastic
Semi-Conductors
They conduct electricity when heated
Potential Difference
Higher the voltage the higher the electrons are pushed/more energy given to push electrons
SI Unit of Potential Difference
Volts/V
1V? (volt)
1J/C (joule)
What is maximum Potential Difference called?
Electromotive force (EMF)
Current Si unit
AMPS
Energy Si unit
Joule
Charge SI Units
Coulombs
Q=5c
T=0.2ms
I=?
T=0.2ms=0.2x10^-3
Q=IT
5=Ix0.2x10^-3
5/10^-3=I
I=25000A
Formula to find Q(Charge)?
Q= IxT
Where is conversion current from?
It’s from negative to positive
Where is convention current from?
It’s from positive to negative
Where is the electron flow from?
Negative to positive
Equation that relates power, current and voltage
-Equation in symbols
-Equation in words
-Equation in unit
P=C x V
Power=Current x Voltage
watts =Ampere x Volt
Equation that relates power, energy and time
-Equation in symbols
-Equation in words
-Equation in unit
P=E/T
Power=Energy/Time
watts=Joules/Seconds
Thermistor
-Dependent on temperature
-As temperature increases the resistance decreases
LDR (Light Dependent Resistor)
Resistance increases as light decreases
How?,l;.
