Tle

• Materials that permit electric charge to move within them are called conductor
• Those that do NOT permit electric charge to move within them are called insulator
• Metals are good conductors nonmetals are good insulator
• Electrical quantities:

  Current , voltage , resistance
• Current is a movement of charged particles in a wire to a specific direction
• Current unit of measure is ampere (A)
• The other name of voltage is electromotive force (emf) or potential difference
• Voltage is the electric pressure that cause current flow the methods of producing a emf induction in generation and chemical reaction in batteries
• Voltage unit of measure is volt/s
• Resistance is opposition to the flow of charge
• Resistance unit of measure is ohm
• There are four factors affecting resistance

  1. Length
  2. Cross-sectional area
  3. Resistivity of materials
  4. Temperature
• Ohm's law is formulated by george simon ohm
• Ohm's law state that the current in a circuit is directly proportional to the total voltage acting in the circuit and inversely proportional to the resistance of the circuit