2.
Static Electricity <ul><li>The build up of an electric charge on the surface of an object. </li></ul><ul><li>The charge builds up but does not flow. </li></ul><ul><li>Static electricity is potential energy . It does not move. It is stored . </li></ul>
3.
Electricity that moves … <ul><li>Current : The flow of electrons from one place to another. </li></ul><ul><li>Measured in amperes (amps) </li></ul><ul><li>Kinetic energy </li></ul>
4.
There are 2 types of currents: <ul><li>Direct Current (DC) – Where electrons flow in the same direction in a wire. </li></ul>
5.
There are 2 types of currents: <ul><li>Alternating Current (AC) – electrons flow in different directions in a wire </li></ul>
6.
There are 2 types of circuits: <ul><li>Series Circuit : the components are lined up along one path. If the circuit is broken, all components turn off. </li></ul>
8.
There are 2 types of circuits: <ul><li>Parallel Circuit – there are several branching paths to the components. If the circuit is broken at any one branch, only the components on that branch will turn off . </li></ul>
10.
Conductors vs. Insulators <ul><li>Conductors – material through which electric current flows easily . </li></ul><ul><li>Insulators – materials through which electric current cannot move . </li></ul>
12.
What is Resistance? <ul><li>The opposition to the flow of an electric current, producing heat . </li></ul><ul><li>The greater the resistance, the less current gets through. </li></ul><ul><li>Good conductors have low resistance. </li></ul><ul><li>Measured in ohms. </li></ul>
13.
What Influences Resistance? <ul><li>Material of wire – aluminum and copper have low resistance </li></ul><ul><li>Thickness – the thicker the wire the lower the resistance </li></ul><ul><li>Length – shorter wire has lower resistance </li></ul><ul><li>Temperature – lower temperature has lower resistance </li></ul>
14.
What is Voltage? <ul><li>The measure of energy given to the charge flowing in a circuit. </li></ul><ul><li>The greater the voltage, the greater the force or “pressure” that drives the charge through the circuit. </li></ul>
15.
Difference b/t Volts and Amps <ul><li>Example – you could say that… </li></ul><ul><ul><li>Amps measure how much water comes out of a hose. </li></ul></ul><ul><ul><li>Volts measure how hard the water comes out of a hose. </li></ul></ul>
16.
Ohm’s Law <ul><li>Resistance = Voltage / Current </li></ul><ul><li>Ohms = Volts / Amps </li></ul>
17.
Practice with Ohm’s Law Ohms Volts Amps 4 100 25 15 150 10 2 30 15 9 45 5 6 48 8
18.
What is an electromagnet? <ul><li>Electromagnet – a magnet made from a current bearing coil of wire wrapped around an iron or steel core. </li></ul>
19.
What is a generator? <ul><li>Generator – a machine that changes mechanical energy to electrical energy </li></ul><ul><li>Usually use moving magnets to create currents in coils of wire. </li></ul>
20.
What is a motor? <ul><li>Motor – a device that changes electrical energy to mechanical energy that can do work . </li></ul>
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