1. What is Power?

Power is the rate at which work is done or energy is transferred over time. It is a scalar quantity measured in watts (W) in the International System of Units (SI).

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

• \( P \) — Power in watts (W)
• \( E \) — Energy in joules (J)
• \( t \) — Time in seconds (s)

Explanation: This fundamental equation shows that power is directly proportional to the energy and inversely proportional to the time over which the energy is expended.

3. Importance of Power Calculation

Details: Calculating power is essential in physics, engineering, and everyday applications to understand energy efficiency, machine performance, and electrical systems.

4. Using the Calculator

Tips: Enter energy 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's the difference between power and energy?
A: Energy is the capacity to do work, while power is how fast that energy is used or transferred.

Q2: What are common units for power?
A: The SI unit is watts (W). Other units include horsepower (hp) and foot-pounds per minute.

Q3: How does this relate to electrical power?
A: Electrical power (P) can also be calculated as voltage × current, but this is equivalent to energy/time when considering electrical work.

Q4: Can power be negative?
A: In calculations, negative power typically indicates energy being absorbed rather than supplied.

Q5: What's a practical example of this calculation?
A: If a light bulb uses 60,000 joules in 1 minute (60 seconds), its power consumption is 1,000 watts (1 kW).