Electric power

• Ammeter


  Measures the electric current in a circuit. The name is derived from the name for 1 wait for electric current, Amperes (A).
• Voltmeter


  Used to measure the voltage and EMF (electromotive force) between two points in an electrical circuit.
• Schematic Symbols


  • Ammeter symbol
  • Voltmeter symbol
• Electromotive force (EMF)


  Characteristic of any energy source capable of pushing electric charge.
• Unit of power is watts or W
• James Watt