ELECTRICITY Flashcards
What is the differences and similarities b/w electric potential energy and potential energy?
BOTH- scalar quantities (not vectors) still have sign
Unit of potential energy is J
Unit of electric potential is Volt=V=J/C
Electric potential difference is also called VOLTAGE
What is the difference between electric field and electric potential?
Electric field- vector
Electric potential- scalar
What does 1 Farad equal?
1 F= 1C/V
What is 1mA?
10^-3
What is one micro?
10^-6
Which direction does current flow?
From the positive to negative terminal
Which directions do the electrons flow?
From negative to positive (opposite to current)
What is current defined as?
Movement of positive ions
What is the SI unit of Ohm?
1Ohm= 1V/1A
Do current and charge get used up?
NO-charge that goes in one end comes out other end
Is current a vector?
NO but it does have direction (pos or neg)
What does resistivity equal?
1/sigma
What does conductivity equal?
sigma
What is the power in electricity?
The energy transformed by a device per unit time P=QV/t
What is effective voltage formula?
Vrms= V0/sqrt2
What is effective current formula?
Irms= I0/sqrt2
What does multiplying voltage and current give you?
Power
What is the electromotive force?
Sources such as battery or generator to produce current
With capacitors in parallel do you add inverse?
NO just add them
How do you calculate capacitors in series?
Add the INVERSES (opposite of resistance calculations)
What is tao?
The time after which 63% of radioactvie nuclei will decay
