Physics Equation List :Form 5 Wave

Transcription

1 Ocillation Phyic Equation Lit :Form 5 Wave f 1 T f frequency (Hz or -1 ) T Period () Dilacement-Time Grah Amlitude, Period and Frequency can be found from a Dilacement-Time Grah Wave v f λ v velocity (m -1 ) f frequency (Hz or -1 ) λ wavelength (m) Dilacement-Ditance Grah λ Wavelength htt:// note.html 1

2 Interference λ ax D λ Wavelength a Ditance between the two wave ource x Ditance between two ucceive anti-node line or node line D Ditance from the wave ource to the lane where x i meaured. Summary Sum of charge Electricity Q ne Q Charge n number of charge article e charge of 1 article Current I Q t Q Charge I Current t time htt:// note.html

3 Potential Difference W Q otential difference, ( or JC -1 ) W energy (J) Q charge (C) Ohm Law and Reitance IR otential difference, ( or JC -1 ) I Current (A or C -1 ) R Reitance (Ω) Reitance R R1+ R R ( + + ) R R R Current Serie Circuit Parallel Circuit The current flow into a reitor the current flow inide the reitor the current flow out from the reitor I A I B I C The current flow into a arallel circuit i equal to the um of the current in each branche of the circuit. Examle I I 1 + I In a erie circuit, the current at any oint of the circuit i the ame. If the reitance of the reitor i the ame, current will be divided equally to both of the reitor. htt:// note.html 3

4 Potential and Potential Difference Serie Circuit Parallel Circuit The um of the otential difference acro individual reitor in between oint in a erie circuit i equal to the otential difference acro the two oint. Examle 1 + The otential difference acro all the reitor in a arallel circuit i the ame. Examle 1 Potential Difference and Electromotive Force If we aume that there i no internal reitance in the cell, the otential difference acro the cell i equal to the e.m.f. of the cell. htt:// note.html 4

5 Electromotive Force and Internal Reitance E I( R+ r) or E + Ir E Electromotive Force () r internal reitance (Ω) otential difference, ( or JC -1 ) I Current (A or C -1 ) R Reitance (Ω) method to find the internal reitance and electromotive force a. Oen Circuit Cloe Circuit method Oen Circuit Cloe Circuit In oen circuit ( when the witch i off), the voltmeter how the reading of the e.m.f. In cloe circuit ( when the witch i on), the voltmeter how the reading of the otential difference acro the cell. With the reence of internal reitance, the otential difference acro the cell i alway le than the e.m.f.. b. Linear Grah method From the equation, E + Ir Therefore -ri + E Gradient od the graf, m -internal reitance Y intercet of the grah, c electromotive force Electrical Energy E Q E Electrical Energy (J) Q charge (C) otential difference ( or JC -1 ) htt:// note.html 5

6 Electrical Power P W P I t P I R P R P Power (W or J -1 ) W Work done/energy change (J) t Time () I Current Potential difference () R Reitance (Ω) Efficiency Root mean Square alue outut ower Electrical efficiency 100% inut ower Electromagnetim rm rm root mean quare voltage eak voltage I rm I I rm root mean quare current I eak current () () htt:// note.html 6

7 Tranformer Inut And Outut Of A Tranformer N inut (rimary) otential difference () outut (econdary) otential difference () N N number of turn in rimary coil N number of turn in econdary coil Power In A Tranformer Ideal Tranformer I I Non-ideal tranformer Efficiency I I 100% inut (rimary) otential difference outut (econdary) otential difference I inut (rimary) current I outut (econdary) current () () Power Tranmiion Ste to find the energy/ower lo in the cable a. Find the current in the cable by the equation PI b. Find the Power lot in the cable by the equation PI R. Energy change of electron in an electron gun Electronic Kinetic energy gain electrical otential energy 1 v mv e e m v eed of electron (m -1 ) otential difference acro the electron gun () e charge of 1 electron (C) m ma of 1 electron (kg) htt:// note.html 7

8 Cathode Ray Ocillocoe ertical cale Y-gain control Horizontal cale Time bae Period Time for 1 comlete Ocillation Frequency, f 1 T Tranitor - Potential Divider Potential difference acro reitor R 1 R1 R + R 1 Potential difference acro reitor R R R + R 1 htt:// note.html 8

9 Radioactivity Alha decay Beta decay Gamma emiion A A 4 4 Z X Z Y + He A A 0 Z X Y e Z n 1+ 1e A Z X A X + γ Z A nucleon number Z roton number Half-life N 1 ( ) n N 0 N Amount of radioiotoe article after nth half life. N 0 Initial amount of radioiotoe article. n number of half life Nuclear Energy - Eintein Formula E mc m ma change (kg) c eed of light (m -1 ) E energy changed (J) htt:// note.html 9