SF ch. 4 electricity
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| A form of energy that produces light, heat, magnetic and chemical changes. | Electricity
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| materials that best transport electricity to a load, i.e. copper, water | Conductors
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| Materials that do not allow current to pass through them.i.e. silk, wood, plastic, rubber | Insulator
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| unit of electric strength | Amp
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| unit of electric pressure | Volt
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| unit of electric resistance | Ohm
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| measure of how much electricity is being used | Watt
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| 1,000 milliamperes is equal to | 1 ampere
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| Electrons move at an even rate; flows in one direction. | Direct current
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| Sources of electricity | Batteries and Generator
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| More current flows than the line is designed to carry. | Overload
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| this can occur when an extension cord with multiple plugs is used to attach 4 or 5 appliances to one wall socket. | Fire
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| Reusable device that breaks the flow of current when an overload occurs. | Circuit breaker
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| Passes through small part of the body | Local shock
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| Passes through the nervous system | General Shock
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| Application of special currents that have certain effects on the skin. | Electrotherapy
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| negatively charged electrode. | Cathode
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| positively charged electrode. | Anode
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| Direct current- low volt and high amp | Galvanic Current
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| Process of forcing an acid or alkali into the skin by applying current to the chemical | Phoresis
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| Produces an alkaline reaction, which can force alkaline soluions to penetrate the skin. | Anaphoresis
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| Introduces water-soluble products into the skin. | Iontophoresis
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| alternating current, produces a mechanical effect, may preserve muscle tone. | Faradic current
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| High frequency current "violet ray", alternating current, different voltages produce heat. | Tesla Current
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| The slight seperation of the electrode from the skin creates a mild, ___________ sensation. | Stimulating
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| Heat energy is transferred from a hotter body to a oooler body in _____ ways. | Three
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| transfer of heat via direct contact. | Conduction
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| transfer of heat via liquid or gas. | Convection
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| transfer of heat through a vacuum. | Radiation
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| White light is also known as | Combination light
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| Visible light can be broken into its individual wavelengths by a________. | Prism
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| The longest wavelengths of the visible spectrum are | Red
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| Two kinds of light used in the salon are | Flourescent and Incandescent
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| _______ percent of sunlight is composed of invisible rays beyond red, Infrared. | eighty percent
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| The light must be placed _____ from the client's face. | thirty inches
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| Ultraviolet rays are also known as _________. | Actinic rays
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| Small doses of UV light can tan the skin and may help the body produce ________. | Vitamin D
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| UV light is __________ and kill bacteria that causes skin infections. | Germicidal
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| The client's _____ should be protected while receiving treatment using UV light therapy. | Eyes
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