Physics

• Voltage is the amount of work needed to move a charge.
• Battery is the collection of cells
• Types of Current Flow:

  • Electron Flow
  • Conventional Current
• Electron Flow goes from negative to positive
• Conventional Current goes from positive to negative
• Electricity is the flow of electrons
• Current is the movement of charges
• Types of Current:

  • Alternating Current
  • Direct Current
• Alternating Current changes the direction at a regular interval
• Direct Current moves in one direction only
• Electric Current is the rate wherein electric flows past a point in a complete electrical circuit
• The SI unit of Voltage is Volts (V)
• The SI unit for Current is Ampere (A)
• q=It where in Current and Charge are directly proportional
• Electrical Resistance is the measure of the opposition to current flow in an electrical circuit
• Resistance controls Current
• Resistor regulates the electric flow
• The unit of Area is m2 or square metres.
• The unit of Length is the meter (m)
• The unit of Resistivity is Ohm-meters (Ωm)
• The symbol for Resistivity is rho (ρ)
• Ohm’s Law is the relationship between the voltage, current and resistance in a circuit.
• Ohm’s law’s proponent is Georg Simon Ohm.
• Ohm’s Law: V = IR
• Current (I) - Andrē Marie Ampère
• I in current means intensité du courant which is the intensity of the current
• Cell is the simplest or basic source of voltage of energy
• Types of Electrodes:

  Cathode - positive

  Anode - negative
• Each cells contain 2 electrodes and electrolytes oxidation takes place
• Cell offers internal resistance
• r = internal resistance
• The symbol for Electromotive Force is E.
• Electromotive Force is when there is no current
• Terminal Voltage (TV) is when current is flowing or working voltage
• TV = E-Ir
• Electrical Energy Consumption = Pt
• P=VI or P=V^2/R
• Ammeter to measure current
• Voltmeter to measure potential difference
• Multimeter - ammeter, voltmeter, ohmmeter