Effects of electric current

Effects of Electric Current

• Three Effects: When electricity flows, three effects occur:

  • Thermal

  • Chemical

  • Magnetic

Thermal Effect

• Heating in Conductors: When current flows through a wire, heat is generated.

  • Factors Influencing Heating:

    • Cross-sectional area of the wire

    • Amount of current flowing

    • Material of the wire

• Applications: The heating effect is used in:

  • Electric fires

  • Heaters

  • Light bulbs (filament glows white hot)

Chemical Effect

• Electrolysis: Passing current through certain liquids causes a chemical reaction.

  • Example: Acidified water breaks down into hydrogen and oxygen gases.

• Electroplating:

  • Coats a cheaper metal with a more expensive one (e.g., copper or silver).

  • Process:

    • Negative electrode: object to be coated.

    • Positive electrode: metal to coat with.

    • Electrolyte: solution of coating metal (e.g., silver nitrate, copper sulfate).

Magnetic Effect

• Creation of Magnetic Field: An electric current generates a magnetic field around the wire.

  • Direction: The field is strongest near the wire and perpendicular to the current flow.

  • Reversal: The magnetic field direction reverses if current direction is reversed.