7.1 Static Charge Name:

Date:

Block:

(Reference: pp. 248 - 254 from BC Science 9)

___________ means stationary or not moving

static charge: __________________________________

_____________________________________________

aka ________ ___________________

Examples:

______________________________________

______________________________________

______________________________________

______________________________________

EARLY THEORIES OF ELECTRICITY

Early scientists hypothesized that there were two

“__________________________”

Benjamin Franklin:

Hypothesized only one kind of “_________________ ________”

He called:

the build-up of "electrical fluid": ___________

(___)

The shortage of "electrical fluid": _____________

(___)

We still use the idea of + and - to refer to ____________

__________ on an object.

In the last two centuries, theories have been developed about electricity

based on _____________.

Early scientists had no accurate way to detect static charge.

The most common method was to touch the object to see if

it delivered a ____________.

In 1748, French physicist and clergyman Jean Nollet

invented the ____________________, a device that can

be used to detect static charge.

POSITIVE AND NEGATIVE CHARGE IN THE ATOM

Remember, all matter is made up of __________, which are

____________.

nucleus: ____ charge

o protons: ___ charge

o neutrons ____ charge.

electrons: ____ charge

In a solid material, the _______________ vibrates but stays in the

same position at the centre of the atom.

The _____________ are outside the nucleus and can move quite easily.

Only the electrons can move in the solid material

All solid materials are charged by the transfer of __________.

If an electron is removed, the atom/object has an overall

__________ charge.

If an electron is added, the atom/object has an overall

___________ charge.

**The transfer of ______________ charges solid materials and changes

the charge on atoms.

FRICTION AND ELECTRON TRANSFER

friction occurs when objects _____ against each other.

can result in one object _________electrons and the other

object _________ electrons.

o Ex. ____________ :a type of plastic used in film and

overhead transparencies.

when rubbed with paper towel the acetate gains

________________, becoming ______________

charged.

the paper towel loses ________________,

becoming __________________ charged.

INSULATORS AND CONDUCTORS

insulators: ______________________________________________

_____________________________________________

Ex. __________, ____________, ______________, and

_____ _________.

________ a static charge.

conductors:______________________________________________

_______________________________________________

Ex. ____________

_____ ______ __________ static charge.

MEASURING CHARGE

The smallest positive charge occurs on a neutral object if it_______ one

electron.

The smallest negative charge occurs on a neutral object: if it _______

one electron.

____________ (___): the unit of electric charge.

o Named after Charles Augustin de Coulomb (1736 - 1806).

o 1 C of charge = ________________electrons.

GENERATING STATIC CHARGE

occurs naturally in clouds that produce _____________.

Due to __________ as hot air rises rapidly in cloud banks.

In the laboratory, first "lightning machine" created in 1929 by

Robert Van de Graaf.

the _____ ___ __________ ______________.

uses friction to produce a large ________

charge on a metal dome.

a moving belt produces static charge at the

______ of the generator and carries it to the top

where it collects on the _______.

APPLICATIONS OF STATIC ELECTRICITY

Valuable uses of static electricity:

___________________________________________

___________________________________________

o ___________________________________________

o ___________________________________________

___________________________________________

DANGERS OF STATIC ELECTRICITY

1. Sparks caused by the build-up of static charge could cause fuel trucks to

________________.

Prevented by cables transferring excess ____________

from the truck to the ground.

This is called _______________________.

2. ____________________ striking buildings

Prevented by the use of __________________ ______

SUMMARY: