#1). anthony does the same amount of work as angel, with more power.
#2). power = (work)/(time) = 41,000 j / 500 s = 82 watts .
#3). power = (work) / (time) = 83 j / 3 sec = 27.7 watts
an ldr's resistance changes with light intensity, while a thermistor's resistancce changes with temperature.
in dark, ldr's resistance is large and in the day/light ldr's resistance is small.
at low temperature, thermistor's resistance is large, while at large temperature it resistance is small.
in an ldr resistance increases as light intensity falls, while in a thermistor resistance falls as temperature falls.
if im wrong im sorry!
not too sure on this one maybe to locate objects under water, to diagnose problems, to treat medical ailments