Which mass is the same as 0.031 g?

0.031 g is equal to 31 grams

0.000031 kg

Explanation:

There are 1000 g in 1 kg, so

0.031 g / 1000 g = 0.000031 kg

The heat developed can be calculated using the power rules as follows:

P = I x V = I^2 x R

First solution is to use the given values of I and R as follows:
P = I^2 x R = (2)^2 x 25 = 4 x 25 = 100 watt

Second solution is to use ohm's law to get V, then substitute to get the power as follows:
V = I x R = 2 x 25 = 50 volts
Power = V x I = 50 x 2 = 100 watt