1 Power in DC Circuits
Construct the circuit shown in Figure LT1-1-2. 
𝑃2
Using only a voltmeter and/or an ammeter, determine the maximum power Pmax that can be dissipated by the variable resistor R2.
(calculated)
You are welcome to use the table below if you think you need to.

Figure LT1-1-1
Figure LT1-1-2
Value
Table LT1-1-1
Pmax
R12
Table LT1-1-2
Hence, or otherwise, determine the resistance "seen" between UTS Black Box 1 terminals 1 and 2. 
Show Table LT1-1-1 to a Lab Tutor.