Ch 20 1 Electric Charge & Static Electricity

Download Ch 20 1 Electric Charge & Static Electricity

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<ul><li> 1. Electric Charge &amp;Static Electricity 20.1 Chapter 20Electricity</li></ul> <p> 2. What produces anet electric charge? </p> <ul><li>Electric Charge = property that causes subatomic particles such as protons and electrons to attract or repel each other </li></ul> <ul><li>Protons have positive charge (+) </li></ul> <p> 3. What produces a net electric charge? </p> <ul><li>Electrons have negative charge (-) </li></ul> <ul><li>Ex. Electric charge = lightning bolt or static cling </li></ul> <ul><li>An XS or Shortage of electrons produces a net electric charge- ions </li></ul> <p> 4. What determines whetheran electric force is attractive or repulsive? </p> <ul><li>Electric Force = the attraction or repulsion between electrically charged objects </li></ul> <ul><li>Like charges repel </li></ul> <ul><li>Opposite chargesattract </li></ul> <ul><li>Double electric charge willdouble the electric force </li></ul> <ul><li>In an atom Electric forces are stronger than gravity = chemical bond </li></ul> <p> 5. What determines the strength of an electric field? </p> <ul><li>Electric field= is the space around an object with an electric charge </li></ul> <ul><li>The strength of an electric field depends on: </li></ul> <ul><li>The amount of charge that produces the field </li></ul> <ul><li>On the distance from the charge </li></ul> <p> 6. What are three ways in which charge is transferred? </p> <ul><li>Charges can be transferred by </li></ul> <ul><li>Friction = Ex. Rub balloon on hair Hair gives up Electron becoming (+) and balloon (-) </li></ul> <ul><li>Contact = Van de Graff Generator a charged metal sphere causes hair to repel each other </li></ul> <ul><li>By Induction = Ex. When you walk across a carpet &amp; touch door knob get a shock </li></ul> <p> 7. How does a static discharge occur? </p> <ul><li>Static discharge is the shock you feel when you touch a door knob. </li></ul> <ul><li>Static discharge occurs when a pathway through which a charge can move forms suddenly. </li></ul> <ul><li>When the gap between door and finger is small.</li></ul> <ul><li>Lightning is the same but more dramatic </li></ul>

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