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Two brush generator - AC Generator
Using the hand crank generator and the principle of conservation of energy, relate the rate of turning the generator to the following:
Frequency of voltage oscillation
Peak Values of Voltage
Power output
Brightness of bulb
Red/GreenLED illumination
Electric generators induce an emf by rotating a coil in a magnetic field.
This change in the angle (θ) causes the emf to be created. As the coil rotates the emf produced alternates in direction, as can be seen in the gif. The voltage, and therefore the current, oscillates between the positive and negative. Hence, the term ALTERNATING CURRENT (AC).
A phasor diagram is one component of a rotating vector. When describing the relationship of the voltage it is a sine curve so therefore it is the RED line on the graph .
Charges in the wires of the loop experience the magnetic force, because they are moving in a magnetic field. Charges in the vertical wires experience forces parallel to the wire, causing currents. But those in the top and bottom segments feel a force perpendicular to the wire, which does not cause a current. - OpenStax College Physics
In the top graph, describe the values/variables on both the x and y-axis and how they are related.
Describe the relationship between the first and second graphs. (How does the bottom graph relate to the top graph?)
AC Generator - Note that the script E stands for emf.
In the generator, the brushes act to maintain electrical contact with the wires leading to the 'load' or resistance.
The generator can either have 2 brushes, as shown to the left. and produce a sinusoidal wave.
Or, the brushes can be connected to a split ring commutator. Which produces a sine square curve (never going negative), therefore direct current (DC)
DC Generator -Note that the script E stands for emf.
A simple demonstration in class can be scaled up to a generator that will produce energy for an entire community or country.
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