Lecture 31a

# Lecture 31a - Alternating Current(AC Please see updated...

This preview shows pages 1–6. Sign up to view the full content.

Alternating Current (AC) Please see updated course calendar

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
) sin( )) cos( ( t BA t BA dt d dt d B Coil rotates with: frequency f (cycles per sec Hertz) angular frequency = 2 f (radians per sec) angle between the coil area and the B field changes with time: = t Generator: rotate a coil in a B field AC voltage Induced emf
3 ) sin( ) ( t V t V peak T f 2 2 : angular frequency [radians/s] F: frequency [cycles/s = Hertz] T: period [s] time for one cycle In USA, f = 60 Hz. What is the period T of the voltage oscillation? A: 1/120 s C: 1 / 60 s E: 1/30 s B: 120 s D: 60 s F: 30 s V peak time

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
AC Voltage across a resistor ) sin( ) ( t V t V peak ) sin( ) sin( ) ( t i R t V R V t i peak peak ) ( sin ) ( 2 t V i iV t P peak peak Instantaneous Power is oscillating from zero to maximum.
5 What is the average (over time) power delivered to the resistor? ) ( sin ) ( 2 t V i iV t P peak peak 2 2 peak peak V i rms rms

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 17

Lecture 31a - Alternating Current(AC Please see updated...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online