Exam 3: Static Electricity

Lightning is the result of static charges built up in clouds that contain a large amount of moisture.

The shock that results from walking across a carpet and touching a doorknob is an example of a(n) _____ static charge.

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

When an object protected by a lightning _____ is struck by a lightning bolt, it will bleed the lightning discharge to ground before the protected object can be harmed.

Electrostatic charges occur on _____.

Static electricity refers to electrons that _____ moving.

Power lines are often protected by lightning _______________ that exhibit a very high resistance at the normal voltage of the line.

Copy machines operate on the principle of static electricity.

Bringing a charged test object near the ball of a charged electroscope causes the leaves to move closer together. This indicates that the test object charge is the _____ polarity as the electroscope charge.

A thundercloud contains only positive electric charges.

A lightning protection device that is grounded at one end, with the other end close to but not touching the object to be protected, is called a lightning _____.

The precipitator uses a high-voltage DC power supply to provide a set of wires with a positive charge and a set of plates with a _____ charge.

The static charge sometimes used during spray painting is an example of a(n) _____ static charge.

Within a lightning bolt, current flows _____.

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

In a clothes dryer, the greatest static charges generally are built up on _____ fabrics.

A precipitator is a type of _____.

Lightning rods provide an easy path to ground for current.

An electroscope can be used to determine the polarity of an electrostatic charge.

Insulators are the only materials that can hold _____ stationary.