electricty Flashcards
what does dc stand for
direct current
static electricity
is a build up of electric charge that can occur on good insulators e.h polythene and perspex rods
polythene rod
gains electrons if a woollen cloth is rubbed on it (become negatively charged
perspex rod
loses electrons if it is rubbed by woollen cloth (becomes positively charged)
gold leaf electroscope
used to : detect charge,show size of charge,test nature of charge ,test for insulator or conductive,shows size of potential diffference
what is current electric current
an electric current is cause by the flow of electrons through a good conductor such as metal
what is electric current
flow of electric charge
uses of electricity
electricity is form of energy that can be changed into other forms of energy.
electrical energy can be converted into
light : light energy do we can see in the dark
heat: heat energy so we can cook + heat buildings
kinetic: kinetic energy for electric motors
sound: sound energy for music
closed circuit
a closed circuit is needed for the current to flow
if there is a break in a circuit then current won’t flow and the electrical energy can’t get through
batteries
Energy provided by a battery or power
pack is needed to move the current
around the circuit
• The battery pumps electrons from its
negative end around a circuit
• The electrons travel all the way around
and are attracted back to the positive end of the battery
the negative end of the batttery is an area of
high electrical pressure
the positive end is
low electrical pressure
