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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

slide2

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
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