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AC Test
Second Test for SCC AC class
| Term | Definition |
|---|---|
| Q, Circuit | XL/R ac, circuit |
| E xl | Q Circuit Egen |
| QCircuit | E xl/ Egen or XL / RT |
| fo | 1 / 2pi (sq rt)LC |
| Bandwidth | BW = (tr)f |
| Q coil | XL/R ac, coil or XL / RW |
| Frequency | number of cycles per second in sine wave |
| Period | The time taken in one cycle in seconds |
| Cycle | waveform reaches complete set of positive and negative values |
| RMS (or effective value) | AC produces same average power as steady (DC) power |
| Phase Shift | Delay between two waveforms |
| Fc | boundary in frequency response where energy begins to reduce |
| Fo | natural frequency where a medium vibration at highest amplitude |
| Bandwidth | range of frequencies where output voltage (current volue) equals 70.7% of max amps |
| Q | ratio of energy stored/dissipates per cycle |
| Low Pass Filter | filter that passes signals with f lower than cutoff f |
| High Pass Filter | filter that passes signals with f higher than cutoff f |
| Bandpass filter | passes f within range |
| Notch Filter | Weakens small range f signals and allows other f to pass |
| Phase relationship between current through and voltage across an inductor | Current lags voltage by 90 deg. |
| Phase relationship between current through and voltage across an capacitor | voltage lags current by 90 deg. |
| Phase relationship between current through and voltage across an resistor | In Phase (out of phase 0 deg) |
| What is reactance and how is it calculated? | non-resistive component of impedence XL-XC or XC-XL |
| What is impedance and how is it calculated? | opposition to electric flow Z = √ (R 2 + (|X L - X C | |
| At resonance, reactance (XL-XC) is | Zero (XL=XC) |
| Minimum impedance | Z=R |
| Angle between EL and EC | 180 deg. |
| Angle between ET and ER | 0 deg |
| Desired value of Q | 10 or more |
| Desired value of R | Low |
| When f is greater than f0 | Inductive |
| Phase angle between I line and E line | Leading Current |
| I Line | Max value (IC=IL) |
| EL or EC | Q x E line |
| RL Circuit Low Pass Filter | XL = 2 pi FL (FL up XL up) (Inductor) |
| RL Circuit High Pass Filter | XL - 0 ohms (F up XL up) parallel with output |
| RC Circuit Low Pass Filter | XC-0 ohms (F up XL down) |
| RC Circuit High Pass Filter | XC = 0 ohms (Capacitor) XC=1 / 2 pi FC |
| RC Coupling Circuit | Blocks DC (low f), Passes AC (high f) |
| At Cutoff, f of RC coupling circuit output V is | 70.7% of Emax |
| When f of V applied to inductor doubles | Reactance doubles |
| When current doubles | Power becomes 4 x original power |
| When V is applied to capacitor | Current leads V by 90 deg |
| When V is applied to resistor | Voltage and Current are in Phase |
| When V is applied to inductor | Voltage leads current by 90 deg |
| Resonance | XL=XC Phase angle is 0 deg |
| XL and XC are how out of phase with each other | 180 deg. |
| BW Formula | Fr / QCircuit |
| Fr occurs at same time as | Fco |
| At Resonance what is at minimum? | Zt |
| At Resonance what is at maximum? | It |
Created by:
SMITHFAM12
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