AUT 242-Chapter 1

2. What are the ampere, volt, and ohm?

Ampere is the measure of the amount of current flow. Volt is the unit of measurement for electrical pressure. Ohm is the unit of measurement for electrical resistance.

3. What are three examples of conducts and three examples of insulators?

Conducts: Silver, Copper and Gold Insulators: Rubber, Plastic and Nylon

4. What are the four sources of electricity?

Friction, Heat, Light and Pressure

10. A potentiometer, a three-wire variable resistance, is used in which type of sensor?

Throttle position (TP) sensors

Voltmeter-

a device used to measure voltage

Free Electrons-

loosely held electrons around an atom usually found in the valence ring

Semiconductor-

materials with exactly four electrons in their outer orbit that are neither conductor nor insulators but can be either an insulator or a conductor

Conductors-

materials with fewer than four electrons in their atom's outer orbit

Insulators-

materials with more than four electrons in their atom's outer orbit. Examples are rubber, plastic and nylon

Static electricity-

occurs when certain different materials are rubbed together and the friction causes electrons to be transformed from one to the other. Both materials become electrically charged. These charges are not in motion, but stay on the surface where they were deposited

Thermoelectricity-

occurs when two pieces of different metals are joined together at both ends and one junction is heated, current passes through the metals

8. Creating electricity by exerting a force on a crystal is __________________.

piezoelectricity

2. Like charges _______________ .

repel each other

3. Carbon and silicon are examples of _________________.

semiconductors

Electron Theory-

states that there electron flows from negative to positive and not the other way

Thermocouple-

temperature-measuring device

Electrochemistry-

the branch of chemistry that deals with the chemical changes produced by electricity and the production of electricity by chemical changes

Ohmmeter-

the meter used to measure electrical resistance

Resistance-

the opposition offered by a substance or body to the passage of electric current through it

Valence Ring-

the outermost electron shell or ring

Electrical potential-

the potential for current flow in a conductor

5. As temperature increases, _______________________.

the resistance of the conductor also increases

Atom-

the smallest particle of an element in which all the chemical characteristic of the element are present

Coulomb-

the standard unit of quantity of electricity in the International System of Units (SI), equal to the quantity of charge transferred in one second across a conductor in which there is a constant current of one ampere

Conventional Theory-

the theory of the flow of electricity through a conductor

Volt-

the unit of measurement for electrical pressure

Rheostat-

type of mechanically operated variable resistor

Ammeter-

used to measure the flow of current

6. The _____ is a unit of electrical pressure.

volt

4. Which unit of electricity does the work in a circuit?

watt

7. Technician A says that a two-wire variable resistor is called a rheostat. Technician B says that a three-wire variable resistor is called a potentiometer. Which technician is correct?

Both Technician A and B

1. What is electricity?

Electricity is the movement of electrons from one atom to another.

Electromotive Force (EMF)-

a technical name for voltage

Ohms-

a unit of measured electrical resistance

Potentiometer-

a variable resistor that acts as a circuit divider to provide accurate voltage drop reading in response to the movement of an object

Piezoelectricity-

current produced by putting crystals under pressure

Bound electrons-

electrons that are held tight and hard for a drifting to occur or to push its way to the valence ring in an atom

1. An electricity conductor is an element with ___________ in its outer orbit.

fewer than four electrons

Ion-

happens when an atom is not balanced and becomes a charged particle

Neutral charge-

happens when the number of negative charged electrons is balanced with the same number of positive charged protons in a atom

Watt-

is the electrical unit for power, the capacity to do work

Electricity-

is the movement of electrons from one atom to another

Ampere-

is the unit used throughout the world to measure current flow

Peltier effect-

is when electrons moving through a solid that can carry heat from one side of the material to the other side

Photoelectricity-

is widely used in light-measuring devices such as photographic exposure meters and automatic headlamp dimmers