3 Fundamentals of Electricity: Unit 3 - Static Electricity

Nuisance static charges are more likely to occur when the air is _____.

dry (low humidity)

Most _____ _____ occur within the cloud.

lightning discharges (lightning bolt)

The object to be painted has a _____ charge.

negative

If you walk across a carpet, touch a doorknob and get a shock, the shock was the result of a _____ static charge.

nuisance

The semiconductor material used as a coating on copy machine drums is _____.

selenium

Lightning rods work by providing a _____ _____ to ground for current flow.

easy path

Electrostatic charges are built up on _____ material.

insulator

Electrostatic charges occur on _____ _____.

insulator material

A static electric charge is an electric charge which _____ _____ moving.

is not

The current flow that occurs within a lightning bolt flows _____ to _____.

negative to positive

A static discharge from a persons body can cause a _____ _____.

painful shock

Protecting objects from lightning strikes can be done by connecting a conductor from the earth to a piece of metal usually mounted on the roof of a building. The piece of metal is called a lightning _____.

rod

Some everyday objects and processes utilize static charges. These charges can be called useful static charges. In a copy machine during the copy process, the drum is charged in specific areas. The toner sticks to the drum in areas that _____ _____ charged.

are positively

A lightning bolt has an average voltage of about ____ volts.

15,000,000

If a thunder cloud has a positive charge, the current in the lightning bolt will flow from the _____ _____.

ground up

Lightning arrestors have _____ resistance until voltage rises.

high

Man made fabric s are better _____ than cotton or wool.

insulators

If an object has a lack of electrons it has a _____ charge.

positive

Lightning arresters are an open circuit prior to a lightning strike. During the lightning strike, an arc is created. This arc is like a _____ circuit.

short

Static electricity is often used in _____ _____.

spray paint

When _____ _____ occurs in nature it can be harmful.

static electricity

The static charge sometimes used during spray painting is called a _____ static charge.

useful

_____ is without a doubt the greatest display of static electric discharge.

Lightning

The _____ uses a high voltage DC power supply to provide a set of wires with a negative charge.

Precipitator

Lightning rods were invented by _____ _____.

Ben Franklin