**ELECTRICAL**

**AIR CORE INDUCTOR**

An inductor that uses air as the only care material.

**ALTERNATING CURRENT**

(AC) current that periodically reverses direction as it flows.

**AMPERE**

The unit by which electrical current is measured. One ampere, or amp, is defined as the flow of 6.28 x 1018 electrons past a given point in one second.

**ARCING**

Current flow through air, as can occur across an open switch.

**ATOMS**

Tiny units of matter that contain electrically charged particles.

**CAPACITANCE**

The ability to store electrical energy.

**CAPACITOR**

A component used to control and/or increase the amount of capacitance in an electrical circuit.

**CIRCUIT**

A complete path for a current, including a voltage source and resistance.

CONDUCTOR

A material that offers very little resistance to electron flow.

CURRENT

The movement, or flow, of electrons in a circuit.

**DIRECT CURRENT**

Current that flows in only one direction.

**ELECTROMAGNETISM**

Magnetism that is created by current flowing through a conductor.

ELECTRON

A negatively charged subatomic particle.

FRICTION

The rubbing of one material against another.

**INDUCTANCE**

A physical property of all conductors that tends to oppose a change in current flow.

**INDUCTION**

The process that produces a voltage due to interaction of a conductor, a magnetic field, and relative motion between them.

INDUCTOR

A component specifically designed to increase the amount of inductance in a circuit.

**INSULATOR**

A material that offers a great deal of resistance to electron flow.

OHM

The unit by which resistance is measured. One ohm is defined as the resistance that allows one amp of current to flow in a circuit when there is one volt pushing the current.

**OHM’S LAW**

A statement of the relationship between current, voltage, and resistance in an electrical circuit: current equals voltage divided by resistance.

OPEN CIRCUIT

A circuit in which the resistance is so great that there is no current flow.

PARALLEL CIRCUIT

A circuit containing two or more parallel paths through which current can flow.

**POWER**

The rate at which work is done. Power is calculated by multiplying current times voltage.

**PROTON**

A positively charged subatomic particle.

**RESISTANCE**

An electrical property that opposes the flow of current through a circuit.

RESISTOR

A component that is put into a circuit to reduce current flow.

**SELF-INDUCTION**

A type of induction that occurs within a single conductor; it occurs when a change in the electromagnetic field around a conductor induces a voltage in that conductor.

**SERIES CIRCUIT**

A circuit that contains a single path for current to follow. The component in a series circuit are connected end to end.

**SHORT CIRCUIT**

A circuit in which the resistance drops to almost zero and current reaches its maximum value.

**STEP-DOWN TRANSFORMER**

A transformer that decreases voltage.

**STEP-UP TRANSFORMER**

A transformer that increases voltage.

**TRANSFORMER**

A component used to change AC voltage to meet specific requirements.

**VOLT**

The unit by which voltage is measured. One volt is defined as the voltage necessary to drive a current of one ampere through a resistance of one ohm.

VOLTAGE

The driving force that makes electrons flow.

VOLTAGE DROP

The amount of voltage across a resistor in an electrical circuit.

**WATT**

The unit by which electric power is measured. The amount of power produced when one volt causes one ampere of current to flow.

WATT-HOUR

The basic unit used to measure electrical energy. Watt-hours are determined by multiplying power by time. One watt-hour is the amount of energy used when one watt of power is delivered to an electrical device for one hour.

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