1. What is Power?

Power is the rate at which work is done or energy is transferred. It is a scalar quantity that measures how quickly work is performed.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

• \( P \) — Power in watts (W)
• \( W \) — Work done in joules (J)
• \( t \) — Time taken in seconds (s)

Explanation: This formula shows that power is directly proportional to the work done and inversely proportional to the time taken to do that work.

3. Importance of Power Calculation

Details: Calculating power is essential in physics and engineering to determine the efficiency of machines, electrical systems, and various mechanical processes.

4. Using the Calculator

Tips: Enter work in joules and time in seconds. Both values must be positive numbers. The calculator will compute the power in watts.

5. Frequently Asked Questions (FAQ)

Q1: What are the units of power?
A: The SI unit of power is the watt (W), which equals one joule per second. Other units include horsepower (hp) and foot-pounds per minute.

Q2: How is power different from energy?
A: Energy is the capacity to do work, while power is the rate at which energy is transferred or work is done.

Q3: What is average power vs instantaneous power?
A: Average power is the total work done divided by total time, while instantaneous power is the power at a specific moment in time.

Q4: Can power be negative?
A: Yes, negative power indicates that work is being done on the system rather than by the system.

Q5: How is electrical power calculated?
A: For electrical circuits, power can be calculated as P = VI (voltage × current) or P = I²R (current squared × resistance).