Understanding Static Electricity and Electric Current

Classified in Physics

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Static electricity:

  • There are electrostatic forces between particles or objects with a positive or a negative charge.
  • Charge is due to the surplus or defect of electrons.
  • Like charges repel each other while opposite charges attract each other.
  • Electric charge is measured in coulomb (C) and has the symbol Q.
  • When there is an imbalance of positive and negative charge, we get a force between the charges according to Coulomb's law.

Electric current:

  • Electric current is a flow of electrons or other charges through a material.
  • Conductor: Electrons can move easily through the conductor.
  • Insulator: It is very difficult for electrons to move through the material. The electrons are not free to move and form bonds.

Electrical Magnitudes:

  • Potential difference is the energy (E) needed to move one unit of charge (Q) from one point to another. The unit is volts (V).
  • Current intensity is the amount of charge (Q) that passes through a conductor at a certain time. The unit is Ampere (A).
  • Electrical resistance is a measure of the opposition to the flow of current. It depends on the material's resistivity. The unit is Ohm (Ω).
  • Ohm's law states the relationship between voltage (V), current (I), and resistance (R) in a circuit: V = I * R, I = V / R, R = V / I.

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