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Principles of Electricity - Review

Electromotive Force (EMF) or Voltage

• Definition: Voltage is the difference between groups of ions.

• Symbols: Represented by "E" or "V".

• Unit of Measurement: Measured in Volts (V).

• Methods for Producing Voltage (EMF):

  • Friction: Generating voltage through the rubbing of materials.

  • Pressure: Using mechanical pressure to produce voltage.

  • Heat: Converting thermal energy into electrical energy.

  • Light: Generating voltage from light sources, e.g., solar cells.

  • Magnetism: Producing voltage through the movement of a magnetic field.

  • Chemical: Generating voltage from chemical reactions, as in batteries.

Electrical Current

• Definition: The movement or flow of electrons through a conductor.

• Symbol: Represented by "I".

• Unit of Measurement: Measured in Amperes (A) or "Amps".

Resistance

• Definition: The opposition that a device or material offers to the flow of current.

• Significance: Resistance affects how much current can flow in a circuit.