Section 6 - Electricity Flashcards
Current def
Rate of flow of charge
I, Q, T formula
Q = It
Direction of current flow
+ to -
Unit of charge
Coulomb (C)
Coulomb def
One coulomb is the amount of Charge that passes in 1 second if the charge is 1 Amp
Potential Difference def
Work done per unit charge moved
Voltage f
v = W/Q (Word done/charge)
Voltage in components connected in a parallel
The same
Current in components connected in a parallel
Shared
Voltage in components conected in series
Shared
Current in components connected in seres
The same
How must a voltmeter be connected
in parallel with the component
Definition of a volt
1 volt is when you convert 1 joule of energy moving 1 coulomb of charge through a component
Resistance f
R = V/I
Resistance def
A measure of how difficult it is for current to flow through a component
Ohmic conductor def
A conductor for which |R is constant
Ohms law
Provided the physical conditions, such as temperature, remain constant, the current through an ohmic conductor is directly proportional to the current across it
Graph for an ohmic conductor
Straight line graph passing through (0,0)
Circuit to obtain an I/V graph
INsert pic
I/V graph for a filament lamp
INsert pic
I/V characteristic for a filament lamp
The resistance of a metal increases as the temperature increases
Semiconductors
Thermistor def
A resistor with a resistance that depends on temperature
NTC thermistor
Negative temperature coefficient
Resistance decreases as temperature goes up
Filament lamp symbol
Pic
Thermistor symbol
Pic