Basic electricity

The current in VAC changes direction times per second as shown below.

Basic electricity

These are approximate values for the cables typically used in theatre. Other types and methods may be rated differently. Connectors Connectors allow temporary connections to be made and broken quickly Basic electricity safely.

Male connectors have exposed contacts. Female connectors have internal contacts inside an insulating shell with holes for plugging the two together. The male is always on the load side of a connection, the female on the line side; "the female has the power! The standard configuration, two parallel blades and a U-ground, is rated at 15 a.

Usually the"hot" terminal is copper colored and the "neutral" is silver colored, and the "ground" is green. Most common dedicated stage connector.

Rated at 20 a. The center pin is "ground", the outside pin nearest the ground is the "neutral", and the other is the "hot".

One blade has a tab bent towards center; that is the ground. The slightly larger blade with silver screw is Basic electricity, and the small blade with the copper screw is "hot". Comes in colors to indicate which leg is which. Rated at over a.

In most common size on stage. Also available in a mini-cam size for 1 cable, rated at a. Y-cord with one male and two female connectors, for plugging two devices into one outlet. Used to plug a device into a different type of outlet.

Direct Current is the type of electricity supplied by a battery. One terminal is positively charged, the other negatively charged, and electricity flows from one to the other, always in the same direction.

However, while it is simple to make and control, DC does not travel well over long distances; it gets used up by the resistance in the transmission lines, and is gone before it gets to where it is needed.

Alternating Current also has a positive and a negative terminal, but the polarity and the direction of flow alternates many times per second. In the United States, electricity alternates polarity times per second, or 60 full cycles per second, i.

AC can travel well over long distances, and so it the choice for power distribution lines. There is no difference between amps or volts between AC or DC.

Basic electricity

Some devices can ONLY operate on one type of system or the other, but otherwise a volt is a volt. Road shows and concert tours typically bring in their own lighting and sound rigs, which means their dimmer racks and sound distribution boxes must be tied in to a power source able to supply large amounts of current.

Power is usually generated at a distance from where it is used. It is supplied as 3-phase power at very high voltages. This allows many kilowatts to flow through fairly small conductors because amperage is effectively small. There are 3 hots, each degrees out-of-phase with the next when their sine waves are plotted against each other, hence the term "3 phase".

There is no neutral. This configuration is called Delta, and is the same type at much lower voltages use to run 3-phase motors.

The power level is brought down through a series of substations. At each step transformers reduce the voltage and increase the amperage until it reaches the line transformers outside the building. At that point, the Delta service is converted to a Wye service, and is brought into the building at the "service entrance".

The Wye service has the same three hot legs, plus an electrical neutral created at the transformer. By this time in either Wye or Delta, the line voltage has been brought down to where each hot terminal is volts above earth potential, called "ground", and in the case of a Wye service, each hot is also v.

However, due to the geometry of the hot phases, there is a difference of v. This is different from the Single-phase system found in some older theatres, and commonly in private homes.

Direct Current Circuit Concepts

In this service two hots are drawn from each end of one phase of a Delta hence Single phaseand a neutral created at the transformer.Choose the right Texas electricity rates for your family.

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