Magnetic Fields 3 Flashcards
What is a property of the emf induced by a coil rotating in a magnetic field
It is alternating
Changes direction over time
Graph showing how the emf induced by a coil rotating in a magnetic field changes over time
What does an oscilloscope show
The variation of voltage with time
What changes when you turn off the time base on an oscilloscope
What do you see for a DC current
What do you see for an AC current
The trace will show all the possible voltages at any time in one area
DC - A dot at the height of the output voltage, as voltage isn’t changing
AC - A vertical straight line, showing all the possible voltages
How do the axis work on an oscilloscope
The Y-axis scale is a no. of volts per division
The X-axis scale is the time base - no. of secs per division
