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| Is the force of pressure in electrical current. |
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| Is the measure of the flow of electrical charges. |
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| Is the measure of an objects opposition to the flow of DC current in a circuit. |
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| Store electrical energy in magnetic fields |
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| Readily pass electical current because they have loose electrons that can easily move between atoms of the material. |
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| Have an electrical conductivity that is between an insulator and conductor. |
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Is the measure of an objects opposition to the flow of current in a circuit.
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| Is the overall opposition to current presented by the circuit. |
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Reverses its flow at a certain frequency.
US - 60 Hz
Europe - 50hz |
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| Limit the flow of electrical current |
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| Store DC electrical current electrostatically. Allows AC to pass but filters depending on frequency. |
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| Transfer electrical energy from one circuit to another through inductively coupled conductors. |
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| Is a semi conductor device with three connections, capable of amplification in addition to rectification. |
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| Allow current to flow in one direction and mostly blocking it in the other. |
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If one lightbulb dies, the current stops flowing
Total Resistance of Circuit = R1 + R2 + R3 + R4 |
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If one lightbulb dies, the current continues flow across the rest of the circuit.
[image] |
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| The algebriac sum of all currents entering and exiting a node must equal zero. |
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Current: I = V / R
Volts: V = I x R
Resistance: R = V/I |
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| Condenser Microphone Function |
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| The diaphragm and the back plate have a voltage between them. When sound waves strike the diaphragm, the two plates move closer together increasing capacitance, and when they move apart, decreasing capacitance. This creates an AC output signal. |
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| Dynamic Microphone Function |
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| As sound waves hit the diaphragm, the diaphragm vibrates the coil over the magnet, which creates an AC signal. |
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| Ribbon Microphone Function |
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| Foil ribbon is suspended in a magnetic field. When sound vibrations move the foil, a current is produced which is "stepped-up" by a transformer. |
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| High impedance device that creates electrical current potential and will create a change in voltage in response to a stress or hit. |
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| AC signal signal causes vibration in the magnetic field of the inductor coil, which moves the magnet surrounding the coil, and vibrates the connected cone. |
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| Directivity Index and Directionality |
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| the relation of on-axis pickup to the total pickup of the microphone in all directions. The higher the directivity index, the more directional the microphone. |
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| As a microphone is brought closer to a sound source, the bass response will increase. |
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| Mic Level in Millivolts (unit) |
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| Reference Level for Mic Measurement |
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| Difference Between +4dBu and -10dBV |
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| +4dBu is 1.23V, and -10dBV is .316V |
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| Weight used for SPL measurements |
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| (A) weighting reduces the low frequencies more than (C), so (C) weighting is used for all studio measurements. |
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| Directionality, Frequency Response, Output Sensitivity, Output Source Impedance, Equivalent Self-Noise Level, Distortion Specifications, Dynamic Range, and Hum Pickup. |
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| Standard level and distance mic measurements are made at |
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| Modern mics are generally _____ impedance |
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| A connection of a low impedance source to a high impedance load results in a _____ voltage transfer |
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| Which type of microphone has the lowest self-noise rating |
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| Formula for Signal to Noise Ratio |
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| 94dB - Self Noise Level = S/N Ratio in dB |
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| Two reasons why it should be difficult to measure the THD of a mic in a classroom setting |
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| A classroom is not an anechoic chamber, and 130db is damaging to the ear. |
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| How do you clean a Condenser microphone |
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| Remove grill and tap to get excess dust out, clean grill with coarse brush, then using a small soft camel hair paintbrush, gradually push the particulates off the disk working in a circular fashion. |
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| The capacity of an inductor is determined by |
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| The number of coils, the type of core, the cross sectional area of the coil, and the length of the coil. |
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