It is difficult to measure resistances less than 1 ohm with a bridge because of which of the following factors?
A. Contact resistance is present between the resistor being measured and the binding posts of the bridge
B. Excessive supply voltage is required to excite the galvanometer
C. The frequency of the excitation source creates excessive skin currents in the resistor under test
D. The excitation voltage causes lowvalue resistors to heat excessively
Share your understanding of this question with the correct explanation.