Ohm's Law

• Current (I) - Amount of charge passing through any point in a conductor per unit time.
• formula of current:

  I = q/t
• I = current: A or C/s

  q = charge: C

  t = time: s
• Conventional current refers to the flow of positive charges from the positive terminal to the negative terminal of a source of voltage.
• Electron current is the flow of electrons from the negative terminal to the positive terminal.
• Direct current is the current that travels in one direction.
• An alternating current is a charge that changes direction at a regular interval.
• Resistance R (Ω) - Opposition of a material to the flow of electric current.
• Resistors - regulate the amount of current passing through a conductor. Values may be fixed or variable.
• Fixed Resistors - Metalized film resistors, carbon resistors, wire- wound resistors, and chip resistors.
• Variable Resistors - Potentiometers, Light-dependent resistors, thermistors, wire-wound rheostat.
• Ohm's Law - The ratio between the voltage and current is a constant, it is resistance.
• Resistance - is the ratio of voltage to the resulting current.
• Formula of Ohm's Law

  R = V/I
• Ohm's Law triangle:

  V

  IR
• Circuit Diagram - Represent the electrical circuit using industry- standard symbols.
• Circuit Diagram - It shows the path of the electrical energy flow, and how the components are connected.
• 2 types of circuit diagram:

  • pictorial
  • schematic
• The schematic style uses industry-standard symbols.
• The pictorial style uses simpler illustrations of the components so that it would be more understandable to a less technical audience.