Electricity Flashcards
Static electricity
A stationary electric charge, typically produced by friction, which causes sparks or crackling or the attraction of dust or hair
Examples of static electricity
Rubbing a pen on jumper to make a stream of water move, van de graaff generator to make my hair stick up
Negatively charged:
Objects gain electrons
Positively charged:
Object loses electrons
Like charges:
Repel each other
Opposite charges
Are attracted to each other
A polythene rod gains electrons if a woollen cloth is rubbed on it
Becomes negatively charged
A Perspex rod loses electrons if it is rubbed by a woollen cloth
Becomes positively charged
Earthing
Occurs when a charged object loses its charge to the earth through a conductor
Electric current
Caused by the flow of electrons through a conductor such as a metal
Electrical energy can be converted into
Light,heat,kinetic and sound
Potential difference
The difference in electrical pressure between positive and negative. Is measured in volts
Resistance
Is the opposite of flow of electrons. The unity is ohm and is measured using an ohmmeter
Resister
If a resisters placed on a circuit which will slow down the slow of electrons
Use of resistors
Used in light bulbs and a heating a coil of a kettle
