Ok, i am given this task by my physics group leader and is required to do an experiment based on the following research question: To investigate the effect of temperature to the conductivity of a charcoal rod. i. How do i heat a charcoal rod to a desired temperature and make it remain constant at that temperature ? ii. When i am conducting the experiment as in letting electric curent go through the rod, wouldn't it heat up due to its resistance ? Again, how do i keep the temperature constant ? Thanks.