electricity core questions Flashcards
what is a circuit symbol
small images that represent an electrical or electronic device or function
what do opposite charges do
attract
what do like charges do
repel
which way do the arrows go on positive field lines
away from the middle
which way do the arrows go on negative field lines
towards the middle
what happens when field lines of like charges overlap
repel
what happens when field lines of opposite charges overlap
form a continuous line
where is the field of a charge strongest
nearest the source
define potential difference
the difference of potential between two points
define current
the flow of charge
what happens to charges when the circuit is off
they are still in the components and wires
what happens when a component in a series circuit breaks
the current cannot flow
define resistance
the measure of the opposition to current flow in an electrical circuit
why does a hot wire have a higher resistance than a cold one
due to the metal ions in the object vibrating allowing less charge to flow per second
recall ohms law
v = i x r
V=A x ohm
v= potential difference
i= current
r=resistance
