Conductors and insulators.

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Presentation transcript:

Conductors and insulators.

Shocking! If you reach for a metal doorknob after walking across a carpet, you might see a spark. The spark is caused by electrons moving from your hand to the doorknob.

Conductor! A material in which electrons are able to move easily is a conductor. The best electrical conductors are metals.

Not a Conductor! A material in which electrons are not able to move easily is an insulator. Most plastics are insulators

Charging Objects Rubbing two materials together can result in a transfer of electrons. Then one material is left with a positive charge and the other with an equal amount of negative charge. The process of transferring charge by touching or rubbing is called charging by contact.

INDUCTION! Because electrical forces act at a distance, charged objects brought near a neutral object will cause electrons to rearrange their positions on the neutral object. The rearrangement of electrons on a neutral object caused by a nearby charged object is called charging by induction.

Induction The balloon on the left is neutral. The balloon on the right is negatively charged. It produces a positively charged area on the sleeve by repelling electrons.

Detecting electric charge When the device is not charged, the leaves hang straight down. Notice the position of the leaves on the electroscope when they are A uncharged, B negatively charged, and C positively charged

Current and Potential The net movement of electric charges in a single direction is an electric current. In a metal wire, or any material, electrons are in constant motion in all directions. As a result, there is no net movement of electrons in one direction.

Current and Voltage When an electric current flows in the wire, electrons continue their random movement, but they also drift in the direction that the current flows. Electric current is measured in amperes.

Voltage difference In a similar way, electric charge flows from higher voltage to lower voltage. A voltage difference is related to the force that causes electric charges to flow. Voltage difference is measured in volts.

Electric Circuits This figure shows an electric current doing work by lighting a lightbulb. A closed path that electric current follows is a circuit. If the circuit is broken by removing the battery, or the lightbulb, or one of the wires, current will not flow.

Resistance As the electrons flow through the filament in a lightbulb, they bump into the metal atoms that make up the filament. In these collisions, some of the electrical energy of the electrons is converted into thermal energy. Eventually, the metal filament becomes hot enough to glow, producing radiant energy that can light up a dark room.

Resistance