Faraday’s Law of Induction - General Physics - Lecture Notes, Study notes of Physics

Download Faraday’s Law of Induction - General Physics - Lecture Notes and more Study notes Physics in PDF only on Docsity! Faraday’s Law of Induction; Lenz’s Law Alternating Current Faraday’s Law of Induction: average emf induced in a circuit is equal to the negative of the change in the magnetic flux through the circuit divided by the elapsed time of this flux change: ξ =            initialfnal initialfinal tt N ∆t ∆ N B SI units: weber per second = Volt N is the number of loops in circuit coil Lenz’s Law: A current produced by an induced emf, ξ, moves in a direction so that its magnetic field opposes the original change in magnetic flux, ∆ΦB. docsity.com Magnetic Flux: B A cosB     Flux through coil is changing because  changed from 0º in (a) to 90º in (b). docsity.com Force opposes the velocity of rod on U-shaped conductor: IF B  l , where I is the induced current and l is the length of the bar within the external magnetic field. If the moving conductor rod and the U-shaped conductor have a total resistance R, the current, I, in the circuit is: R ξ I v l docsity.com AC Current and Voltage Direct Current (DC): continuous flowing electric charges which are steady and in one direction Alternating Current (AC): flowing charges which continuously reverse direction-produced by ac generator (alternating EMF)  I I ωtsin  , f2πω  , I-maximum current (current amplitude), I is the instantaneous current  V=V ωtsin , V-maximum voltage (voltage amplitude), and V is the instantaneous voltage f=60 Hz so ω=377 rads/s docsity.com Root-mean-square (rms): I I ( 0 707 I2rms av 2 ) .   I (V 0 7072rms av V V V 2 ) .    Average power: 2 I I 2 2 2 rms rms VV1 1 P R R 2 2 R R     docsity.com