Tài liệu Teach Yourself Electricity & Electronics P2 ppt

... have a motor that changes electricity into useful mechanical energy. A magnetic field contains energy of a unique kind. The science of magnetism is closely related to electricity. Magnetic phenomena ... conductors of electricity. This is because the atoms or molecules are usually too far apart to allow a free exchange of electrons. But if a gas be- comes ionized, it is a fair conductor of...

Ngày tải lên: 22/12/2013, 21:18

... Companies. Click here for terms of use. Teach Yourself Electricity and Electronics Preface This book is for people who want to learn basic electricity, electronics, and com- munications concepts ... is divided into four major sections: Direct Current, Alternating Cur- rent, Basic Electronics, and Advanced Electronics and Related Technology. At the end of each section is a multip...

Ngày tải lên: 13/12/2013, 01:16

... have a motor that changes electricity into useful mechanical energy. A magnetic field contains energy of a unique kind. The science of magnetism is closely related to electricity. Magnetic phenomena ... conductors of electricity. This is because the atoms or molecules are usually too far apart to allow a free exchange of electrons. But if a gas be- comes ionized, it is a fair conductor of...

Ngày tải lên: 13/12/2013, 01:15

... Companies. Click here for terms of use. Teach Yourself Electricity and Electronics Preface This book is for people who want to learn basic electricity, electronics, and com- munications concepts ... 310 Calculation of power factor 310 How much of the power is true? 313 xii Contents Teach Yourself Electricity and Electronics Third Edition Stan Gibilisco McGraw-Hill New York...

Ngày tải lên: 13/12/2013, 01:15

... Fundamentals of Power Electronics R. W. Erickson 1 INDEX Air gap in coupled inductor, 502 in flyback transformer, 503 in ... 195-196, 200-202 averaged switch modeling, 239-245 basic approach, 198-209 Fundamentals of Power Electronics R. W. Erickson 10 Geometrical constant (see K g , K gfe ) Graphical construction of ... two-pole filters, 34-36 Cuk converter example, 32-33 in filter induct...

Ngày tải lên: 13/12/2013, 01:15

... for Using Labels with Loops <<label_name1>> LOOP <<label_name2>> LOOP END LOOP <<label_name2>> END LOOP <<label_name1>> You will use the example ... BEGIN 2: <<year_loop>> 3: FOR year = v_START_YEAR to v_END_YEAR 4: LOOP 5: <<day_loop>> 6: FOR day = 1 to v_last_day_of_month 7: LOOP 8: <<month_loop>> 9: FOR ....

Ngày tải lên: 15/12/2013, 05:15

... maintain_pay_history 2: AFTER INSERT OR UPDATE OR DELETE ON employee 3: FOR EACH ROW 4: WHEN ((new.pay_rate <> old.pay_rate) 5: OR (new.pay_rate IS NULL AND old.pay_rate IS NOT NULL) 6: OR (new.pay_rate ... the employee count; they do not initialize it to the correct value. You must initialize the counts yourself, which can be easily done by issuing this SQL statement: 302 Day 11 L IST...

Ngày tải lên: 15/12/2013, 05:15

... ‘OK’,’OR’,’PA’,’RI’,’SC’,’SD’, 34: ‘TN’,’TX’,’UT’,’VA’,’VT’,’WA’, 35: ‘WI’,’WV’,’WY’)) 36: OR (zip <> ltrim(to_char(to_number(zip),’09999’))) THEN 37: RAISE_application_error(-20001,’The new ... e.home_address.zip_code, 5: ‘5173433333’) 6: WHERE emp_id = 598; 7: 8: 1 row updated. 9: 10: SQL> 11: SQL> COMMIT; 12: 13: Commit complete. 348 Day 12 L ISTING 12.5 continued A NALYSIS...

Ngày tải lên: 15/12/2013, 05:15

Ngày tải lên: 21/12/2013, 03:16

... SQL*Plus 1: SQL> VARIABLE emp_id NUMBER 2: SQL> VARIABLE emp_name VARCHAR2(30) 3: SQL> EXECUTE :emp_id := 514; 4: 5: PL/SQL procedure successfully completed. 6: 7: SQL> EXECUTE get_super_name2(:emp_id,:emp_name); 8: 9: ... get_super_name2(:emp_id,:emp_name); 8: 9: PL/SQL procedure successfully completed. 10: 11: SQL> PRINT emp_id 12: 13: EMP_ID 14: 15: 514 16: 17: SQL> PRIN...

Ngày tải lên: 24/12/2013, 12:17