- R -

Rb

Rubidium An element with the atomic number of 37.

RC Circuit

A network containing resistors and capacitors used mostly as a timer circuit.

RC Constant

The time constant of an RC circuit. It is equal (in seconds) to the value of the resistance in ohms multiplied by the capacitance in farads.

RC Engine

A shortened term for rotary combustion engine.

RC Time Constant

The time constant of a resistor and capacitor connected in series. The time in seconds is equal to the resistance in ohms multiplied by the capacitance in farads.

RCC

1.abbreviation for Remote Climate Control Module (Ford).

RCD

Refrigerant containment device.

RCM

Abbreviation for Restraints Control Module (Airbag Module ) ((GM)).

RCRA

An abbreviation for Resource Conservation and Recovery Act.

RCU

1. abbreviation for Remote Chassis Unit (Ford).

RCV

Rollover check valve.

RDES

Remote divert/electric switching valve.

RDK

(Porsche) Tire Pressure Monitor System.

Re

Rhenium An element with the atomic number of 75.

Reactance

The impedance that a pure inductance or a pure capacitance provides to current flowing in an ac circuit.

Reaction Disk

The components in the vacuum power booster that provide pedal feel or feedback to the driver.

Reaction Member

The member of a planetary gearset that is held in order to produce an output motion. Other members react against the stationary, held member.

Reaction Time

1. The amount of time required to physically apply the brakes of a vehicle after mentally being aware of the necessity to do so. 2. The amount of time required from the moment the Christmas tree light turns green until the vehicle trips the starting-line timing light.

Reactivity

The characteristics of a material that cause it to react violently with another material, such as air, heat, or water.

Read Vapor Pressure (RVP)

A method of determining vapor pressure of gasoline and other petroleum products. Used as an indicator of the volatility of gasoline. The Read Vapor Pressure of gasoline is the pressure of the vapor in a sealed gas tank when the fuel is raised to 100o F and varies with altitude.