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

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

View Full Document Right Arrow Icon
Alternating Current (AC) Please see updated course calendar
Background image of page 1

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

View Full Document Right Arrow Icon
) 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
Background image of page 2
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
Background image of page 3

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

View Full Document Right Arrow Icon
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.
Background image of page 4
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
Background image of page 5

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

View Full Document Right Arrow Icon
Image of page 6
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 Right Arrow Icon
Ask a homework question - tutors are online