P = E/t
: This formula is also called the mechanical power equation. Here E stands for energy in joule and t stands for time in seconds. This formula states that the consumption of energy per unit of time is called power.
What are the 3 equations for power?
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).
How do you calculate power?
Power is a measure of the amount of work that can be done in a given amount of time.
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 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 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 is the unit of power?
Power (P) is the rate at which energy is transferred or converted. Thus, power equals work divided by time (P = W / t). The SI unit of power is
the watt (W)
, in honor of Scottish inventor James Watt (1736 – 1819).
What are types of current?
There are two kinds of current electricity:
direct current (DC) and alternating current (AC)
. With direct current, electrons move in one direction. Batteries produce direct current. In alternating current, electrons flow in both directions.
What is Ohm’s law state?
Ohm’s law states that
the current through a conductor is proportional to the voltage across the conductor
. … V=IR where V is the voltage across the conductor and I is the current flowing through it.
What is SI unit current?
Unit of electric current:
ampere (A)
The ampere
, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 ×10
− 19
when expressed in the unit C, which is equal to A s, where the second is defined in terms of ∆ν
Cs
.
What is work done SI unit?
Units. The SI unit of work is
the joule (J)
, named after the 19th-century English physicist James Prescott Joule, which is defined as the work required to exert a force of one newton through a displacement of one metre.
What is the stress formula?
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What is work and its types?
Work is a scalar quantity and is the product of two vector quantities. Depending on the value of q, there are three types of work:
When q = 0°, work is said to be positive
. Stretching of the spring is an example of positive work as the force is acting in the direction of displacement of the spring.
What is the minimum power?
This theory predicts that the most likely coalition to form in a group will be one that wins but comprises the individuals with the smallest amounts of power consistent with this outcome. …
What is power equal to in physics?
The standard metric unit of power is the Watt. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. Thus, a Watt is equivalent to
a Joule/second
.
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.
