PhysicsScalar QuantityNCTB পদার্থবিজ্ঞান অধ্যায় ৪ (কাজ, ক্ষমতা ও শক্তি)
Power
Bengali: ক্ষমতা•Pronunciation: পাওয়ার•Symbol: P
Standard Definition:
The rate at which work is done or energy is transferred per unit of time.
📐 Mathematical Equation, Units & Dimensions
Defining Mathematical Equation
Standard SI Unit
W (Watt) or J/s($W$ (ওয়াট) বা $J/s$)
Dimensional Analysis
CGS Unit
erg/s
📖 Physical Concept & Comprehensive Explanation
Power measures how quickly work is produced. 1 Watt represents 1 Joule of work done per second. Another practical industrial unit is horsepower, where 1 HP = 746 Watts. The ratio of useful power output to total power input defines mechanical efficiency.
🎯 High-Yield Revision Points
- ✓Power = Work / Time (P = W/t) or Force * Velocity (P = Fv).
- ✓1 Watt = 1 Joule per second.
- ✓1 Horsepower (HP) = 746 Watts.
Use Online Solver for Power
Compute step-by-step solutions, verify formulas, and plot interactive diagrams on biggan.me.
❓ Frequently Asked Exam Questions (FAQ)
Common questions in board and competitive entrance examinations
Q1: Define 1 Watt. How many Watts equal 1 Horsepower?
One Watt is one Joule of energy transferred per second. 1 Horsepower equals 746 Watts.