A student calibrated a calorimeter using an electric heating coil. A current of 1.50 A with a potential difference of 4.50 V was applied for two-and-a-half minutes. A digital probe recorded a temperature rise of 5.35 °C. The value of the calibration factor, in J °C^–1, is
A. 189
B. 42.1
C. 3.15
D. 0.317

Solution