# Ag. Constructions II - Unit 6 (Electricity)

## 24 terms

### Electricity

The flow of electrons in a conductor.

### Circuit

The path that electrons take to and from their source (set).

### Static

Electrons that do not move. This can cause a shock.

### Direct Current (DC)

Current that flows in only one direction.

### Alternating Current (AC)

Current that reverses the direction of flow many times each second.

### Insulators

Conductors of electricity that are used to confine electricity to the path from it's source to the device being powered. Glass and rubber are examples of these.

### Service Entrance

Where the electricity enters a building.

### Service Panel

Follows the meter and serves as the housing to the circuit breakers.

### Overcurrent

Exists when the current flow in a circuit exceeds the amperage rating of the circuit's conductors, loads, or other devices.

### Circuit Breaker

Heat-sensitive switch which automatically trips when the electrical demand is too great.

### Fuse

A device with metal links that conduct electricity. You have a box for these on your vehicle, even.

### GFCI

Type of breaker that is extremely sensitive to circuit imbalances. Found in damp areas such as bathrooms, kitchens, outside, etc.

### NEC

Set of guidlines establishing electrical code.

### Voltage

Electrical pressure.

### Voltage Drop

When electricity is carried by long wires, this is what happens.

### Amperage

The amount of electrical energy flowing past a point in a circuit.

### Watts

Measure of electrical power, or the energy available to do work.

### Kilowatts

Units of 1,000 watts. This is what the meter that reads electricity on your house goes by.

### Resistance

Tendency of the conductor to resist the flow of electrons or current, generating heat.

### Ohms

Resistance is measured in this unit of measurement. Named after someone.

### Phase

Timed source of electricity through a conductor.

### Single-Phase

Phase that consists of only three wires; one ground, one neutral and one hot.

### Three-Phase

Three single phases combined.