# (Voltage by kiayanna Wright )

Voltage is the strenghth of electricity.The Italian physicist by the name of Count Alessandro Guiseppe discovered voltage.
When voltage is measures A division should be made between the voltage at the point of supply (minimal system voltage) and the voltage rating of the equipment (use voltage). The typical the utilization voltage is 3% to 5% lower than the nominal system voltage.
Power supply system voltage is nearly sinusoidal in nature. Voltages are spoken as root mean square (RMS) voltage. Voltage tolerances are for steady-state task. Momentary heavy loads, or switching operations in the power delivery network, may cause short-term abnormalities out of the tolerance band. In general, power supplies derived from large networks with many sources are more stable than those supplied to an isolated community with perhaps only a single generator. It is often referred to as electric potential.
When a voltage is generated by a battery, or by the attractive force according to Faraday's Law, this generated voltage has been usually called an electromotive force. This force existed only during the time that the electrons were unevenly distributed between the two termininals. ( Gerrish pg 16)
For an example, voltage from heat, if two dissimilar pieces of metal are twisted together and heated, then a potential difference or voltage develops across the ends of wires. Such a device is known as thermocouple. eventhogh the voltage is very small, it can be used to indicate the temperature of the heat. Therocouples are used extensively as heat indicating and control devices. A meter attacahed to the ends of the thermocouple responds to a chane in voltage. The dial on the meter can be calibrated to read in degrees of heat.
Symbol for voltage is (V) The formula for voltage is V= (I)(R) which is current x resistance

# Application of (Voltage)

We use voltage in our lives on a daily basis, by the use of cell phones, televisions, radio, stove, computer etc.

# References

1. Beiser, A. (1988). Physical Science (2nd Edition). New York, NY: McGraw Hill
2. http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elevol.html
3. Gerrish, Howard. (2004). Electricity (10th edition) . Goodheart- Willcox Company, INC

This WikiPage developed by (kiayanna wright and summer 2011