Hertz
We have learnt previously, from the diagram below, that we can create an alternating current (AC) by turning the handle through 360°.
Turning this handle once every one second will create the following diagram.
This is a plot of voltage or current against time and at this speed you create 1 hertz per second.
1 hertz = one 360° revolution of the handle in one second
Three revolutions per second would look like:
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-1.4df6ee6.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-2.d516bb3.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-1.b0b0513.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-2.f89189d.jpg)