4 2 electricity review

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4 2 electricity review

  1. 1. ELECTRIC CURRENT ELECTRIC CURRENT-The flow of charges.  Charges flow from the positive terminal to the negative terminal.  There must be intermediary path for the charges (conductors).  There must be potential difference between two points. This will literally push the charges from one terminal to another. The greater the potential, the greater the push.
  2. 2. CURRENT I= Q/t I=current (A/ampere) Q=charge (C/coulomb) t=time interval (s/second)
  3. 3. OHM’S LAW (Current) I= V/R I=current (A/ampere) V=voltage (V/volts) R=resistance (Ω/ohms)
  4. 4. VOLTAGE- electrical potential difference, electric tension or electric pressure RESISTANCE- property of a conductor due to which it opposes the flow of current through it. I= V/R I=current (A/ampere) V=voltage (V/volts) R=resistance (Ω/ohms)
  5. 5. Resistivity According to ohm’s law, the resistance of a metallic conductor depends on the following: 1. Length of the conducting wire- the longer the wire, the higher its resistance. 2. Cross-sectional area of the conductor- the thicker the conductor, the lower the resistance. 3. Nature of the conductor- the more free electrons there are, the lower the resistance.
  6. 6. RESISTANCE R=ρL/A R=resistance (Ω/ohms) ρ=resistivity of the conductor (Ω·m / ohm-meter) L=length of the wire (m) A= cross sectional area (m2)
  7. 7. Electric Circuit
  8. 8. POWER  RATE OF DOING WORK  THE CONVERSION OF ELECTRICAL ENERGY INTO OTHER FORMS LIKE HEAT ENERGY, CHEMICAL ENERGY, MECHANICAL ENERGY, OR LIGHT ENERGY
  9. 9. POWER P=QV/t P=IV P=I2 R P=V2 /R P=power (W/Watts) Q= Charge(C/Coulomb) V=voltage (V/volts) T= time interval (s/seconds) I=current (A/ampere) R=resistance (Ω/ohms)
  10. 10. Electric Circuit  Series Circuit  Parallel Circuit  Combined Circuit
  11. 11. Series Circuit
  12. 12. Parallel Circuit

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