physics - electrical charge and current

whats makes up the nucleus of an atom

protons and neutrons

what charge does a proton have

positive

what charge does an electron have

equal negative charge

what charge does a neutron have

neutrons are uncharged

what is a charged atom called

an ion

what circuit symbol is this

a cell

what circuit symbol is this

open switch

what circuit symbol is this

closed switch

what circuit symbol is this

bulb

what circuit symbol is this

diode

what circuit symbol is this

light emitting diode

what circuit symbol is this

ammeter

what circuit symbol is this

voltmeter

what circuit symbol is this

fixed resistor

what circuit symbol is this

variable resistor

what circuit symbol is this

fuse

what is the function of a cell

it sources electrical energy to a circuit

what is the function of a switch

it enables the current in a circuit to be switched on or off

what is the function of a bulb

an indicator to show current is passing through the circuit

what is the function of a diode

only allows current to flow in one direction

what is the function of a light emitting diode

emits light when a current passes through it

what is the function of an ammeter

it is used to measure electric current

what is the function of a fixed resistor

it limits the amount of current that flows through a circuit

what is the function of a variable resistor

it allows current to be varied

what is the function of a fuse

designed to break the circuit if a the currents is greater than a certain amount

what is the function of a voltmeter

it is used to measure the potential difference

what is an electrical current

the flow of charge

what determines the size of an electrical current

the amount of electrons flowing per second

what is the formula for charge

Q=I x T

what is the unit for charge

coulombs

what is the unit for current

amperes

what is the unit for time

seconds

what is the formula for current

I = Q/T

what is the equation for tim

T = Q/I

how are ammeters connected in circuits

in series

how are voltmeters connected in circuits

in parallel

what is the formula for resistance

r = V/I

what is the formula for potential difference

v = I x R

what is the formula for current

i = V/R

what does A.C mean

alternating current

what does D.C stand for

direct current

what colour is the live wire

brown

what colour is the neutral wire

blue

what colour is the earth wire

green and yellow stripe