Practice question

Given: In a circuit, a 20 V battery with negligible internal resistance is connected across a cubical network of 12 resistors, each 2 Ω . What is the total current? These values define the system as per NCERT data. Formula: Equivalent resistance of cube network: R_{eq = 5/6 R = 5/6 × 2 = 10/6 = 5/3 Ω. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Total current: I = fracVR_{eq = frac205/3 = 20 × 3/5 = 12 A . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.