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58 Cards in this Set
- Front
- Back
Transient |
The relationship between a charge in current and a change in applied voltage |
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In RC time constants, resistance does what? |
Impedes current flow |
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What is the purpose of RC Time constants |
To indicate the rate of a charge or discharge of a capacitor |
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Capacitance |
Determines the amount of charge a capacitor can accumulate |
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How many time constants are required for full charge? |
5 |
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RL time constants |
Inductors oppose current change, adding resistance to change |
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How many time constants are required for max current? |
5 |
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Time constants current Increase in inductance causes |
Increase in time per time constant |
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RC TRANSIENT CIRCUITS FAULTS Open capacitor |
Capacitor waveform- identical to input Resistor waveform- zero waveform |
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RC TRANSIENT CIRCUIT FAULTS shorted capacitor |
Capacitor- zero waveform Resistor- identical to input |
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RC TRANSIENT CIRCUIT FAULTS open resistor |
Capacitor- DC component of input Resistor- AC portion of input |
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RC TRANSIENT CIRCUIT FAULTS shorted resistor |
Capacitor- identical to input Resistor- zero waveform |
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LCR circuits |
The circuit effect of the inductor and the effect of the capacitor cancel each other |
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Series LCR circuit XL=XC |
Purely resistive |
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LCR series circuit XL>XC |
Inductive |
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LCR series circuit XL |
Capacitive |
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LCR parallel circuits XL=XC |
Purely resistive |
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LCR parallel circuits XL>XC |
Capacitive |
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LCR parallel circuit XL |
Inductive |
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LCR parallel circuit |
Branch currents determine if circuit is inductive or capacitive
Branch reactance and current are inverse of each other |
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XL AND XC ARE OPPOSITES XL-XC |
Negative is capacitive Positive is inductive |
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Resonance |
The condition in a circuit when inductive reactance equals capacitive reactance |
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LCR series circuit resonance Impedance |
At minimum when LCR is resonant |
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LCR series circuit resonance Current |
At maximum |
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LCR series circuit resonance Voltage |
Voltage drops across the resistor are maximum at resonance |
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LCR parallel circuit resonance Impedance |
Maximum |
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LCR parallel circuit resonance Current |
Minimum |
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LCR parallel circuit resonance Voltage |
Stays the same or equals applied voltage |
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Long time constant |
Low EC, high IC, Low XC |
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Short time constant |
High EC, low IC, high HC |
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How is an open component in an parallel LCR recognized? |
Branch current measures 0A |
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Voltage drop across a resistor in a parallel resonant circuit with an open inductor |
Decreases below resonance |
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Transformer |
Purpose-transfer power |
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Transformer power relationship |
Voltage and current levels change but power in is always the same as power out |
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Transformer input |
Applied to primary |
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Transformer output |
Taken from the secondary |
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Iron core transformer |
Mostly used in power supplies |
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Air core transformer |
Most often used in radio circuits |
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Transformer operation |
Operate on a principle of mutual inductance (ability of a magnetic field of one coil to induce voltage in a second coil) |
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Transformer most common faults |
Shorts and opens |
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Purpose of a diode |
To allow current in one direction and stop it in the other direction |
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Anode |
Represented by an arrow Positive side |
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Cathode |
Represented by a bar Negative side |
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Diode current flow |
Cathode to anode only |
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Forward biasing |
Allows current flow |
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Reverse biasing |
Back (Definition) No current flow |
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Knee voltage |
Voltage drop of a diode in forward bias |
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Silicon Voltage drop |
.7 |
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Germanium voltage drop |
.3 |
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Phase relationship of a capacitor and inductor |
Exactly 180 degrees apart |
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A shorted component in a parallel resonant circuit is indicated by |
The branch current measures maximum current |
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In an LCR circuit XL and XC... |
Oppose current at 180 degrees |
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RC TRANSIENTS occur when |
The voltage across a capacitor changes |
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NTYPE |
Has free electrons to move |
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PTYPE |
Has holes free to move |
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Diodes change current flow from |
AC to DC |
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Forward bias |
Functions like a closed switch |
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Reverse bias |
Functions like an open switch |