ppt Ohm's law


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ppt Ohm's law

  1. 1. Ohm’s Law by: Muhamad Abdul Jalil (09330271)
  2. 2. <ul><li>Standart of competence : </li></ul><ul><li>5. To a pply electricity concept in various problem and a variety technology product. </li></ul><ul><li>Basic competence : </li></ul><ul><li>5. 1. To Formulates the mulberry of electricity is closed series ( one loop) </li></ul>
  3. 3. <ul><li>Indicator : </li></ul><ul><li>To f ormulate the mulberry of electric current strength in closed series (the electric current strength). </li></ul><ul><li>To f ormulate the mulberry of electric resistance strength series (the electric resistance strength). </li></ul><ul><li>To f ormulate the mulberry of tension insimple closed series uses Kirchof Law II . </li></ul>
  4. 4. Ohm’s Law <ul><li>Current through an ideal conductor is proportional to the applied voltage </li></ul><ul><ul><li>Conductor is also known as a resistor </li></ul></ul><ul><ul><li>An ideal conductor is a material whose resistance does not change with temperature </li></ul></ul><ul><li>For an ohmic device, </li></ul><ul><ul><li>V = Voltage (Volts = V) </li></ul></ul><ul><ul><li>I = Current (Amperes = A) </li></ul></ul><ul><ul><li>R = Resistance (Ohms = Ω ) </li></ul></ul>
  5. 5. Current and Voltage Defined <ul><li>Conventional Current : (the current in electrical circuits) </li></ul><ul><li>Flow of current from positive terminal to the negative terminal. </li></ul><ul><li>- has units of Amperes (A) and is measured using ammeters . </li></ul><ul><li>Voltage : </li></ul><ul><li>Energy required to move a charge from one point to another. </li></ul><ul><li>- has units of Volts (V) and is measured using voltmeters . </li></ul>Think of voltage as what pushes the electrons along in the circuit, and current as a group of electrons that are constantly trying to reach a state of equilibrium .
  6. 6. Ohmic Resistors <ul><li>Metals obey Ohm’s Law linearly so long as their temperature is held constant </li></ul><ul><ul><li>Their resistance values do not fluctuate with temperature </li></ul></ul><ul><ul><ul><li>the resistance for each resistor is a constant </li></ul></ul></ul><ul><li>Most ohmic resistors will behave non-linearly outside of a given range of temperature, pressure, etc. </li></ul>
  7. 7. Voltage and Current Relationship for Linear Resistors Voltage and current are linear when resistance is held constant.
  8. 8. Ohm’s Law continued <ul><li>The total resistance of a circuit is dependant on the number of resistors in the circuit and their configuration </li></ul><ul><ul><li>Series Circuit </li></ul></ul><ul><ul><li>Parallel Circuit </li></ul></ul>
  9. 9. Kirchhoff’s Current Law <ul><li>Current into junction = Current leaving junction </li></ul>The amount of current that enters a junction is equivalent to the amount of current that leaves the junction
  10. 10. Kirchhoff’s Voltage Law <ul><li>Net Voltage for a circuit = 0 </li></ul>Sum of all voltage rises and voltage drops in a circuit (a closed loop) equals zero
  11. 11. Series Circuit <ul><li>Current is constant </li></ul><ul><li>Why? </li></ul><ul><ul><li>Only one path for the current to take </li></ul></ul>
  12. 12. Series Equivalent Circuit
  13. 13. Parallel Circuit <ul><li>Voltage is constant </li></ul><ul><li>Why ? </li></ul><ul><ul><li>There are 3 closed loops in the circuit </li></ul></ul>
  14. 14. Parallel Equivalent Circuits
  15. 15. <ul><li>We’ve now looked at how basic electrical circuits work with resistors that obey Ohm’s Law linearly. </li></ul><ul><li>We understand quantitatively how these resistors work using the relationship V=IR, but lets see qualitatively using light bulbs. </li></ul>
  16. 16. <ul><li>Matur </li></ul><ul><li>THANKYOU </li></ul>