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Meters and Motors with magnetism. Measuring electric current  A galvanometer can be used to measure current in a wire.  This is made of a solenoid and.

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Presentation on theme: "Meters and Motors with magnetism. Measuring electric current  A galvanometer can be used to measure current in a wire.  This is made of a solenoid and."— Presentation transcript:

1 Meters and Motors with magnetism

2 Measuring electric current  A galvanometer can be used to measure current in a wire.  This is made of a solenoid and a thin magnetic needle.  The thin magnet is held in one direction by a spring, and placed on the solenoid.  The solenoid is arranged so when turned on the magnetic field will pull the needle against the spring.

3 Galvanometer If it is calibrated for amps it is an ammeter, if for volts it is a voltmeter

4 Motor  A galvanometer works similar to the way a DC motor works.  Motor- coverts electrical energy into kinetic (rotational) energy  A galvanometer will make a half rotation, a motor must simply continue this process and make several complete rotations.

5 DC motor  Place a solenoid loop in between two permanent magnets.  Supply current to the solenoid that the attraction/repulsion will rotate the solenoid  Have the rotation disconnect the solenoid from the power source in ¼ of a turn  In the next ¼ of a turn have the power source reconnect so that current will flow in the opposite direction.

6 DC motor

7 Bottom view of contact point Stationary contact points for electric current Rotating brushes connected to solenoid loop and complete the circuit Insulators that opens the circuit

8 View of solenoid loop through magnets northSouth Current through solenoid N S northSouth Loop rotates ¼ turn then no current. Momentum carries it northSouth ¼ later it is reconnected in the opposite directions N S northSouth Loop rotates ¼ turn then no current. Momentum carries it Now we are back here Motor in action

9  pg 736  16-17; 28-35


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