Kirchhoff's First Law (Junction Rule) for electrical circuits is based entirely on the principle of conservation of: MCQ with Answer and Explanation

Explanation:
MA = Load / Effort. For ideal, also = Effort arm / Load arm.

Explanation:
K = ½ × 10 × 25 = 125 J.

Explanation:
Energy density = energy/volume. Energy has dimensions [ML²T⁻²], volume [L³], so energy density = [ML²T⁻²]/[L³] = [ML⁻¹T⁻²]. Pressure = force/area = [MLT⁻²]/[L²] = [ML⁻¹T⁻²], identical. Force is [MLT⁻²], power [ML²T⁻³], momentum [MLT⁻¹]. This equivalence explains why pressure appears in Bernoulli's equation alongside kinetic/potential energy density. Memory aid: 'Pressure and energy density share dimensions [ML⁻¹T⁻²]'. This dimensional analysis question tests ability to derive and compare formulas, frequently appearing in competitive exams to assess conceptual depth.