(Q) the amount of electricity traveling through a circuit.
it is measured in coulombs (C)
(I) is the amount of charge passing in unit time (1s).
I = Q / t it is measured in amperes (A)
is placed in line (in series) with the circuit.
is a measure of the energy givin to the charges in a circuit.
is placed across (in parallel with) the component being measured.
is when materials oppose charges passing through them. Increasing the resistance of a circuit decreases the current.
R = V / I
have all the components in a row or loop.There are no branches there is onlt
Potential divider circuit
use 2 or more resistors or a potentiometer to provide a part of a voltage.
have more than one path for the charges to follow
is the rate at which energy is transformed
P = E / t
how many joules of electrical energy have been transformed?
E = Pt
Electrons move in only one direction.
Electrons movement is back and forth.
Light emitting diodes (LED)
are made from two semi-conductor materials. When electrons cross the junction in the correct direction it emits --light. The diode symbol has to 'point' from + to - from a power supply.
as the temperature increases, its resistance decreases.
The light dependent resistor (LDR)
as the light increases its resistance decreases.
the purpose of it is to increase the amplitude of an electrical signal.