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u Sounds at the frequency ratios 3:2 and 4:3 possess “perfect consonance,” sounds at 5:3 and 5:4 possess “medial consonance,” and sounds at 6:5 and 8:5 possess “imperfect consonance” Predict the consonance of Do-Re-Mi from their frequencies, and then actually play the notes on the piano. u Using the EA-200’ s frequency conversion function, create and produce consonant notes. Next, play the same notes on the piano for comparison. English MeasurementMeasurement 2-8-2 . Calculator Operation u Record the sound on the analysis, and view the frequency. u Find the applicable program 2-16-2), input it into your calculator, and then run it. u Use the EA-200 frequency conversion 55555 1 Before Conversion 2 After Conversion f (Hz) :Frequency N(counts) : Number of Counts u Find the applicable program (Natural Frequency and Sound) in the Program Library (P.2-16-2) , input it into your calculator, and then run it to use FFT graph ( 1, 2) . 55555 Other Things To Do 55555555555555555555555 . Electronic Sound u Consider why notes synthesized on the EA-200 are different from those produced by the piano. u Use the EA-200 to record Do played using a piano timbre on the computer MIDI sound source, and check its frequency components. Next, compare this with the frequency u In many cases, physical properties become evident by studying frequency component of Do played on the acoustic piano. components. Consider why this is so. u Consider what noise is by checking its frequency components. 5555555555555555555555 20020601 English 2-9-1 Direct Current and English 2-9-1 Direct Current and Activity: SetupActivity: Setup This activity investigates and coil. Theory Generally speaking, electrical current electrical current flows through a capacitor, electrons are accumulated, and the capacitor stores the charge. The accumulation of an electrical charge is loss of the charge by the capacitor is called “discharging.” Connecting a resistor and capacitor serial circuit flow to the capacitor, which charges until it reaches a steady state. Now is removed and the circuit is closed, current flows to the discharges until it reaches a steady state. Current flows direction that it flowed during charging. The change in capacitor voltage during the transient phase until the capacitor reaches a steady state, while charging represented by the expression shown below. t – RC VC = V – VR = V ( 1– e ) 1 Charge Circuit 2 Discharge Circuit t VC = VR = Ve– RC VR (V): Voltage Across the Resistor VC(V): Voltage Across the Capacitor V(V) : Power Supply Voltage R( .) : Resistance C(F) : Capacitance t (s) : Time When the current flowing through a coil changes over time, the coil induces voltage, like an electrical generator. This is called “self-induced electromotive force,” which acts to oppose the change in current. When a D.C. power supply is connected in a resistor and coil series circuit, the effect of the coil’s self-induced electromotive force can be observed until current reaches a fixed value. Similarly, self-induced electromotive force can also be observed by cutting off the power supply to a circuit through which steady current is flowing. The change in coil voltage during these transient phases is represented by the expressions below. R – t VL = VR – V = – Ve L R – t 1 Circuit With VL = VR = Ve L Power Supply VR (V): Voltage Across the Resistor 2 Circuit Without VL (V): Voltage Across the Coil Power Supply V(V) : Power Supply Voltage R( .) : Resistance L(H) : Self-inductance t (s) : Time . Equipment Battery (D.C. Power Supply) Resistor Capacitor Coil Switch Voltage Measurement Setup (EA-data communication cable, voltage probe) . Building the RC Series Circuit u The product of the resistance value and the capacitance should be around 1. 1 3V D.C. Power Supply 2 Switch 3 10k. Resistor 4 100.F Capacitor 5 Voltage Probe (CH1) 6 EA-200 . Building the RL Series Circuit u The quotient when the resistance value is divided by the self-inductance of the coil should be around 1. 1 3V D.C. Power Supply 2 Switch 3 0.1. Resistor 4 100mH Coil 5 Voltage Probe (CH1) 6 EA-200 20020601 Operating Operating Operating Operating . Measuring Data u Prepare the Voltage Measurement Setup. At the same time you start operation, move the switch u Wait until the circuit achieves a steady 1 Switch 2 Power Supply Connected 3 Power Supply Cut u Prepare the Voltage Measurement Setup. At the same time you start the measurement operation, move the switch to “OFF” to disconnect the power supply. u Wait until the circuit achieves a steady state. 1 Switch 2 Power Supply Connected 3 Power Supply Cut u Perform the above operation for the RC series circuit and the RL series circuit. u Read and check the RC and R/L values from the graph. English MeasurementMeasurement 2-9-2 . Calculator Operation u Perform the following operation probe. Using E-CON m“E-CON” w1(SETUP) b(Wizard) w 1(CASIO) b(Volt) 0.02w255w1(YES) Using a Calculator Program Find the applicable program in the Program Library 2-16-3)...