You should be able to recognise the graph of current against voltage for a diode. The diode has a very high resistance in one direction. This means that current can only flow in the other direction.

A voltage reference (also called a band-gap reference) provides the same functionality as a Zener diode, yet requires far less current to maintain a more-accurate voltage. While a Zener diode uses ...

Some diode manufacturers caution against using the diode tester function in ohmmeters because it could exceed the reverse-voltage and forward-current ratings of sensitive diodes. This is ...

The highest current version, CDCLD500, has a limiting voltage of 0.9V and reaches its nominal current at 2V applied (right). Central compares this with a 350mA JFET constant current diode with a ...