Power Formula. Power is a rate at which work is done, or energy is used. It is equal to the amount of work done divided by the time it takes to do the work . The unit of power is the Watt (W), which is equal to a Joule per second (J/s).
What is the formula for power?
Power equals work (J) divided by time (s) . The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s).
What does power equation mean?
Power Formula. Power is a rate at which work is done, or energy is used. It is equal to the amount of work done divided by the time it takes to do the work . The unit of power is the Watt (W), which is equal to a Joule per second (J/s).
What are the 3 power equations?
P = ΔV 2 / R
We now have three equations for electrical power, with two derived from the first using the Ohm’s law equation. These equations are often used in problems involving the computation of power from known values of electric potential difference (ΔV), current (I), and resistance (R).
What is power example?
Power is defined as the ability to act or have influence over others. An example of power is the strength needed to run five miles . An example of power is the authority a local government has to collect taxes. ... The definition of power is operating electrically or having strength or force.
How is power defined?
1 : possession of control, authority, or influence over others . 2 : a nation that has influence among other nations a foreign power. 3 : the ability to act or produce an effect It’s in your power to change things. 4 : the right to do something the president’s powers. 5 : physical might : strength The wind grew in power ...
What is current formula?
The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as I = V/R . The SI unit of current is Ampere (Amp).
What is work done formula?
Mathematically, the concept of work done W equals the force f times the distance (d), that is W = f. d and if the force is exerted at an angle θ to the displacement, then work done is calculated as W = f . d cos θ .
How do you calculate total power?
Total power (PT) is defined as: PT = P1 + P2 + P3... Pn . As an example: A series circuit is made up of three resistors with resistance values of 5 ohms, 10 ohms, and 15 ohms. A parallel circuit has the same voltage across each branch that is equal to the source voltage.
How do you find minimum power?
Use the formula for power: Power = Voltage x Current, or P = VI. If you are trying to calculate the minimum load and you happen to only know the power and voltage ratings of your power supply, you can use the formula P = V 2 /R , which can become R = V 2 /P.
What are the types of power?
- Coercive power.
- Reward power.
- Legitimate power.
- Expert power.
- Referent power.
Why is power so important?
It is important to understand that there are benefits to having power in your life. Less Stress – Power helps bring more control in your life . Feeling that you are in control and can make a difference in your work environment and home environment can reduce feelings of helplessness that can cause stress.
How is power used?
Common power tactics include controlling access to information , controlling access to persons, the selective use of objective criteria, controlling the agenda, using outside experts, bureaucratic gamesmanship, and forming coalitions and alliances.
How is power defined in society?
Many scholars adopt the definition developed by German sociologist Max Weber, who said that power is the ability to exercise one’s will over others (Weber 1922). Power affects more than personal relationships; it shapes larger dynamics like social groups, professional organizations, and governments.
What is the difference between power and force?
Force is the fundamental result of an interaction between two objects , while power is an expression of energy consumed over time (work), of which force is an element. ... Force and power can both be described and measured, but a force is an actual physical phenomenon, and power in itself is not.
What is SI unit of power?
The watt (symbol: W) is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second, and is used to quantify the rate of energy transfer. ... The watt is named after James Watt, an 18th-century Scottish inventor., The watt (symbol: W) is a unit of power.
