Meters and Motors

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# Meters and Motors - PowerPoint PPT Presentation

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

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
• 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

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

G

Voltmeters
• measure voltage