Unit 3 Static Electricity

Copy machines operate on the principle of static electricity

• True

• False

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

• True

• False

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

• True

• False

A thundercloud contains only positive electric charges.

• True

• False

Most lightning discharges associated with a cloud occur between the cloud and the ground

• True

• False

Current always flows from positive to negative.

• True

• False

Lightning rods provide an easy path to ground for current

• True

• False

A precipitator is a type of _____.

• air filter

• lightning rod

• small wire

• power supply

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.

• negative

• positive

• neutral

Static electricity refers to electrons that _____ moving.

• are

• are not