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#Power

23 public questions tagged with this topic.

PHYSICS

A transformer has N_p = 500, N_s = 250 . If V_p = 240 V (rms), what is the secondary voltage?

Given: A transformer has N_p = 500, N_s = 250 . If V_p = 240 V (rms), what is the secondary voltage? These values define the system as per NCERT data. Formula: V_s/V_p = N_s/N_p. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: V_s = V_p × N_s/N_p = 240 × 250/500 = 120 V . 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.

Ref: NCERT Physics Textbook for Class XI and XII, Chapter: Units and Measurements and Physical World, Topic: Dimensional analysis and fundamental principles.

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PHYSICS

In a new system, the unit of mass is 0.25 kg, length is 2 m, and time is 0.5 s . What is the value of 1 W ( kg m² s^{-3

Given: In a new system, the unit of mass is 0.25 kg, length is 2 m, and time is 0.5 s . What is the value of 1 W ( kg m² s^{-3 ) in this system? Formula: 1 W = 1 kg m² s^{-3. Substitution & Calculation: New units: kg = 0.25 α, m = 2 β, s = 0.5 γ . 1 W = (0.25 α) (2 β)² (0.5 γ)^{-3 = 0.25 × 4 × 8 = 8 α β² γ^{-3 . Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

Ref: NCERT Physics Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII, continuing as per NCERT advisory for 2026-27),Topic: Fundamental laws, definitions and applications as per latest NCERT. The section explains governing laws, formulas like μ₀ = 4π.

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PHYSICS

A 4 kg mass is lifted 6 m in 3 s at constant speed. What is the power? (Take g = 10 m/s² )

Given: A 4 kg mass is lifted 6 m in 3 s at constant speed. What is the power? (Take g = 10 m/s² ) These values define the system as per NCERT data. Formula: Work W = mgh = 4 × 10 × 6 = 240 J. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Power P = W/t = 240/3 = 80 W . 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.

Ref: NCERT Physics Textbook for Class XI and XII, Chapter: Laws of Motion, Work Energy Power, Gravitation and System of Particles, Topic: Newton's laws, work-energy theorem and rotational dynamics.

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