Question

The voltage drop across a standard resistor of 0.2 Ω is balanced at 83 cm. Find the magnitude of the current, if the standard cell emf of 1.53 V is balanced at 42 m.

(a) 13.04 A

(b) 10 A

(c) 14.95 A

(d) 12.56 A

I have been asked this question by my college director while I was bunking the class.

My question comes from Advanced Problems on Measurement of Low Medium and High Resistance in division Measurement of Resistance of Electrical Measurements

Answer 1

Right option is (c) 14.95 A

To elaborate: Voltage drop per unit length = \(\frac{1.53}{42}\) = 0.036 V/cm

Voltage drop across 83 cm length = 0.036 × 83 = 2.99 V

∴ Current through resistor, I = \(\frac{2.99}{0.2}\) = 14.95 A.