Electricty Flashcards
1
Q
Electric current
A
the rate of flow of charge
I = Q/t
2
Q
potential difference
A
the work done by each coulomb of charge traveling between two points on a circuit
V = W/Q
3
Q
Resitance
A
a measure of how current is restricted through a component
R = V/I
4
Q
Power
A
Rate of energy transfer. P = E/t
5
Q
emf (Electromotive force)
A
Joules of energy the battery transfers from chemical energy to electrical energy per unit charge
6
Q
terminal p.d.
A
V (as opposed to v)
7
Q
potential divider
A
A method of splitting potential difference by connecting 2 resistors in series. Total p.d is split in the ratio of their resistances
8
Q
potentiometer
A
Potential divider when a variable resistor is used instead of fixed resistor and thermistor/LDR. Useful when need continuous values for output voltage e.g. stereo
