# Physical Science Chapter 7 and 8 Vocabulary

## 26 terms

### Static Electricity

electricity produced by friction

### Law of Conservation of Charge

states that charge can be transferred from one object to another but cannot be created or destroyed

### Conductor

a material that easily allows the flow of electricity

### Insulator

a material that does not allow heat or electrons to move through it easily.

### Charging by contact

process of transferring charge between objects by touching or rubbing

### Charging by induction

Charging an object without direct contact between the object and a charge

### Electric Current

a flow of electricity through a conductor

### Circuit

an electrical device that provides a path for electrical current to flow

### Voltage Difference

the push that causes charges to flow from an area of high voltage to an area of low voltage. measured in volts

### Resistance

any mechanical force that tends to retard or oppose motion

### Ohm's Law

the law that states that resistance is equal to voltage divided by current.

### Series Circuit

a circuit in which the objects are connected in a single path

### Parallel Circuit

a closed circuit in which the current divides into two or more paths before recombining to complete the circuit

### Electric Power

the rate at which electrical energy is converted to another form of energy

### Magnetism

the force of repulsion (pushing) or attraction (pulling) between poles of magnets

### Magnetic Field

the region around a magnet where the magnetic force is exerted

### Magnetic Pole

one of two points, such as the ends of a magnet, that have opposing magnetic qualities

### Magnetic domain

a region in which the magnetic fields of all atoms are lined up in the same direction

### Electromagnet

temporary magnet made by passing an electric current through a wire coiled around an iron bar

### Electric Motor

a device that converts electrical energy into mechanical energy

### Electromagnetic Induction

the process of creating a current in a circuit by changing a magnetic field

### Generator

engine that converts mechanical energy into electrical energy by electromagnetic induction

### Turbine

rotary engine in which the kinetic energy of a moving fluid is converted into mechanical energy by causing a bladed rotor to rotate

### Direct Current

an electric current that flows in one direction steadily

### Alternating Current

an electric current that reverses direction sinusoidally

### Transformer

an electrical device by which alternating current of one voltage is changed to another voltage