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Meters and Motors. Principles of Physics. F. S. N. F. e -. A wire loop placed in a uniform magnetic field experiences a turning force The loop only rotates 90˚, then stops. dial. spring. F. S. N. F. e -. Galvanometers.

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Meters and motors

Meters and Motors

Principles of Physics


Meters and motors

F

S

N

F

e-

  • A wire loop placed in a uniform magnetic field experiences a turning force

  • The loop only rotates 90˚, then stops


Galvanometers

dial

spring

F

S

N

F

e-

Galvanometers

  • measure weak electric currents, and thus measure magnetic fields

  • made by placing a wire loop in a magnetic field

    • a needle and a spring are attached to the loop

      • the needle rotates with the loop to indicate the current value

      • the spring allows the needle to return to its initial position after the current is removed


Ammeters

G

Ammeters

  • measure larger currents

  • made by adding a low resistance shunt in parallel with a galvanometer

    • Most of the current flows through the shunt. The needle moves less, to measure bigger currents

    • Lower the shunt’s resistance, bigger current it can measure


Voltmeters

G

Voltmeters

  • measure voltage

  • made by adding a high resistance shunt in series

  • Voltmeters are added in parallel because their high resistance keeps current from being diverted through the meter


Electric motor
Electric motor

  • A motor converts electrical energy into mechanical energy

  • An iron core is attached to a shaft that allows it to spin

  • A coil is wrapped around the iron core to concentrate the magnetic field and increase the turning force


Electric motor1
Electric motor

  • Split ring commutators reverse the current after each ½ rotation so it continues to spin in the same direction

  • Brushes are wires that brush against the stationary contacts on the shaft