# Book N - Chapter 1: Introduction to Electricity

## 27 terms

### Alternating current

(AC) electric current in which the charges continually switch from flowing in one direction to flowing in the reverse direction

### Battery

"a device that is made of several cells and that produces an electric current by converting chemical energy into electrical energy"

### Cell

a device that produces an electric current by converting chemical energy into electrical energy

### Circuit

a complete, closed path through which electric charges flow

### Conduction (electrical)

a method of charging an object that occurs when electrons are transferred from one object to another by direct contact

### Conductor (electrical)

a material in which charges can move easily

### Current

a continuous flow of charge caused by the motion of electrons; the rate at which charge passes a given point; expressed in amperes (A)

### District Current

"(DC) electric current in which the charges always flow in the same direction"

### Electric discharge

the loss of static electricity as charges move off an object

### Electric field

"the region around a charged particle that can exert a force on another charged particle"

### Electric force

the force between charged objects

### Electric power

"the rate at which electrical energy is used to do work; expressed in watts (W)"

### Electrode

the part of a cell through which charges enter or exit

### Electrolyte

in a cell, a mixture of chemicals that carries an electric current

### Induction

"a method of charging an object that occurs when charges in an uncharged object are rearranged without direct contact with a charged object"

### Insulator (electrical)

a material in which charges cannot easily move

### Law of electric charges

"the law that states that like charges repel and opposite charges attract"

a device that uses electrical energy to do work

### Ohm's Law

"the law that states the relationship between current (I), voltage (V), and resistance (R); expressed by the equation I = V/R"

### Parallel circuit

a circuit in which different loads are on separate branches

### Photocell

the part of a solar panel that converts light into electrical energy

### Potential difference

energy per unit charge; specifically, the difference in energy per unit charge as a charge moves between two points in an electric circuit (same as voltage); expressed in volts (V)

### Resistance

the opposition to the flow of electric charge; expressed in ohms (Ω)

### Series circuit

a circuit in which all parts are connected in a single loop

### Static electricity

the buildup of electric charges on an object

### Thermocouple

a device that converts thermal energy into electrical energy

### Voltage

"the difference in energy per unit charge as a charge moves between two points in an electric circuit (same as potential difference); expressed in volts (V)"