what is current measured in
amps
what is current
the rate of flow of charge at a point in the circuit
what is electrical current
a flow of negatively charged partciles (electrons)
do electtrons go from negative ti positive or vice versa
negative to positive
for a current to flow the circuit must what
be complete no gaps, have a power source, circuit must be made of conductors
what isvoltage
a measure of the difference in electrical energy between two points in a circuit
what is resistance
the impediment to the flow of charge caused by a wire
what is conventional current
rate of flow of positive chrge- this is in the oppoiste direction to the flow of electrons
what is potential difference
the work done per unit charge in moving between two points in circuit
the greater the resistencae what heppens for the current
the harder it is for current to flow through the component
what is a fuse
a thin peice of wire which overheats and melts if the current is too high
describe ohms law
at constant temperature volatge equals current
exqmple of ohms lawy
if you double voltage, current doubles
what is current like in a series circuit
stays the same
what is voltage like in a series circuit
shared between componnets
what is resistance like in a series circuit
the sum of all of them
what is current like in a parallel circuit
shared across components
what is voltage like in a parallel circuit
the same
what is resistnace like in a parallel circuit
less than smalest resistor
what does a cell do in a circuit
supplies voltage
what does an open switch in a circuit do
breaks the circuit
what does a closed switch do in a circuit
completes the circuit
what does an ammetre do
measures current in amps
what does a vltmetre do
measures voltage in volts
