**Power Physics**

Power physics is is the amount of energy delivered or absorbed by an element in a given time (p = dW / dt). The unit in the International System is the watt, one joule per second.

Power can be described as the rate at which energy is produced or consumed: when an action requires energy, such as lifting a heavy object up a floor, this energy is the same whether the object is ascended slowly or quickly. There is however a physical difference, it is that climbing it quickly requires more power.

**Formula power physics formula**

p = dW / dt

where P is power, W is work, and t is time.

**Derivations from other quantities**

P = E/t (Power = Energy / Time)

P = F v (Power = Force . Velocity)

P = V I (Power = Volt . Current)

P = τ ω (Power = Torque . Angular velocity)

Read also: Physics Symbols and Chemical | Meanings and Explanations

**How to find a power?**

There are several calculations that can be used to find a power. These are for example:

- multiply a force by a speed: pulling a rope with a force of 10 newtons and at two meters per second represents a power of 20 watts.
- in electricity, multiplying an electrical intensity by an electrical voltage.
- by division, we can find an average power by dividing an energy by a time. For example, if logs of wood weighing about two kilograms each represent an energy of 30,000,000 joules, and one is added per hour (3,600 seconds) to a fire, this fire has an average power of 30,000,000 / 3,600 = 8,333 W or 8.3 kilowatts.

**Examples**

**Calculate the work if, Power = 30 , Time = 10 , Work = ?**

Formula: Work = Power x Time

Steps: Putting values

= 30 x 10

= 300 _{j}

**Calculate the time, if, Power = 50 , Time = , Work = 500**

Formula: Time = Work/Power

Steps: Putting values

= 500/50

= 10 _{N}

**Calculate the power. Power = , Time = 50 , Work = 350**

Formula: Power = Work/Time

Steps: Putting values

= 350/50

= 7 _{m}