- Lenz' Law describes the direction in which induced voltage
causes current to run around a loop: the voltage pushes
the current in the direction which will
**oppose**the change in magnetic flux through the loop. - In other words, Lenz' Law states that induced currents try to maintain the original magnetic flux through a loop of wire (even though they don't quite make it).
- Most electrical generators turn mechanical energy into a voltage via magnetic induction. Lenz' Law shows why the voltage produced by such generators alternates sign.
- The maximum voltage produced by a generator of
area
**A**rotating in a magnetic field**B**at a rate of**w**radians per second isV(max) = N * A * B * w

where**N**is the number of turns in the rotating loop. - Note that the angular velocity
**w**(radians/second) is related to the period**P**(seconds) and frequency**f**(1/second) of rotation as follows:2*pi w = 2*pi*f = ------ P

- Also note that the maximum voltage
**V(max)**is 1.41 times larger than the RMS voltage; people usually use the RMS voltage to describe ordinary wiring, such as 120-volt circuits in the home.

Viewgraph 1

Viewgraph 2

Viewgraph 3

Viewgraph 4

Viewgraph 5

Viewgraph 6

Viewgraph 7

Viewgraph 8

Viewgraph 9

Viewgraph 10

Viewgraph 11

Viewgraph 12

Viewgraph 13

Copyright © Michael Richmond. This work is licensed under a Creative Commons License.