Answer to Question 4


You can carry out the experiment to measure the exponential rise in voltage across a capacitor easily in the lab with basic physics equipment.  Explain why you cannot investigate inductive transients in this way.  Consider the time constant in your argument.

The time constant in an inductive rise (or fall) is very short.

To increase it, you need to reduce the resistance.

This is not easy because the resistance arises due to the inductor being made of a coil of wire.

The time is much shorter than the human reaction time to read a stopwatch and a meter.

Therefore there is a lot of uncertainty.

The way to do an investigation is to use a data-logger.