Science in Action Notes_ Electrical Principles & Tech. (1

Science in Action Notes_ Electrical Principles & Tech. (1

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1/30/12 1/6«/133-science-in-action-notes-electrical-principles-a-tech-10?t« _ Print _ Research Links: 'The Atoms Family' (A Great Electrical Resource Site) 'Just for Kids' (Fun and Games - About Electricity) 'Theatre of Electricity' 1.1. - Static Electricit\ When you get a 'shock',feel a 'jolt' or a 'spark', you are experiencing the same type of electrical effect that makes lightning. Static electricity happens when there is an imbalance of electrons (which have negative charges). Electrical Charge Most objects have the same number of positive ( proton ) and negative ( electron ) charges. This makes them neutral (no charge). When there is a difference in the electrical charge, certain actions are predictable, because of The Laws of Electrical Charges . Charge separation occurs, when a charged object is brought close to a neutral object. The charged electrons repel the electrons in the neutral object and the charged object is then attracted to the protons of the neutral object ( balloon on a wall ) Electrical Discharge is the movement of charges whenever an imbalance of charges occurs. The action results in neutralizing the objects. The over-charged electrons repel the electrons in the object and the positive protons attract the charged electrons causing a discharge or 'miniature lightning bolt'. Van de Graaff (VDG) Generators These generators build up an excess of static charge using friction. A rubber belt rubs a piece of metal abd transfers the charge to a sphere. When you touch the sphere the charge builds up on you. (Remember! - like chaUgeV Uepel - that is why your hair strands separate as you touch the sphere as the charge builds up on your body.) 1.2. - Current Electricit\ Certain animals, namely, the electric eel, can produce electric shock, to kill or stun prey. They have a special organ that contains specialized muscle cells called elecWURSlaTXeV . Each cell procuces a small amount of electrcity. When all the cells work together, a large amount of electricity is produce and used to help the eel
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1/30/12 2/6«/133-science-in-action-notes-electrical-principles-a-tech-10?t« survive. This t\pe of electricit\ is like static electricit\, which builds up and then discharges. It does not flow continuousl\. Electrical devices need a stead\ flow of electricit\. The stead\ flow of charged particles is called electrical current . The flow continues until the energ\ source is used up, or disconnected. Amperes
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This note was uploaded on 01/30/2012 for the course SCIE 027 taught by Professor Edward during the Fall '11 term at Broward College.

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Science in Action Notes_ Electrical Principles & Tech. (1

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