Current, Resistance, Voltage, and Power

• Current– is the flow of electric charges.
• Types of electric flow

  1. Conventional flow - the charges flows from the positive (+) terminal to the negative (-) terminal of the source.
  2. Electron flow - the charges flows from the negative ( (--) terminal to the positive (+) terminal of the source.
• Voltage - Energy required to move the charges in a given circuit. It can also be defined as the potential difference between the two terminals of circuit.
• Resistance - is the ability of a material to oppose the flow of current. Units of ohms (Ω).
• Resistivity - the amount of resistance that the material can with hold depending on the materials used. measured in units of ohm meter ( Ωm )
• Resistor - The main function of this in a circuit is to control the flow of current to other components.
• In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines.
• Ohm's law - States that the ratio of the applied voltage to the current is constant to resistance.