- work done = force × distance moved in direction of force.
- change in gravitational energy = mgh.
- power = work donetime taken, power = rate of energy transfer.
- power = force × velocity.
- efficiency = useful energy transferredtotal work done × 100 %
What is the relationship between work and power physics?
Power is the rate at which work is done. In this case, rate means per unit of time. Power is calculated by dividing the work done by the time it took to do the work. Let’s consider an example that can help illustrate the differences among work, force, and power.
What is work and power?
Work is defined as the process of energy transfer to the motion of an object through the application of force. This is usually represented as the product of force and displacement. The SI unit of work is Joule. Power is defined as the amount of energy transferred in unit time. The SI unit of power is the watt.
What are the 3 formulas for power?
- P = E t.
- P = W t.
- P = V 2 R.
How do you solve work and power problems?
What is formula of work done?
To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.
How do I calculate power?
Power is equal to work divided by time. In this example, P = 9000 J / 60 s = 150 W .
What is the formula for calculating work?
The formula for calculating work is Work = Force x Distance . Hence, to calculate the distance from force and work, proceed as follows: Determine the work done, W , when the force, F , is applied. Divide the work done, W , by the applied force, F .
What is the SI unit of work energy and power?
SI unit of work = joule (J) SI unit of energy = joule (J) SI unit of power = watt (W) Dimensional formula of work =ML2T−2.
How are work and power the same?
2 Answers. Work is the energy needed to apply a force to move an object a particular distance, where force is parallel to the displacement. Power is the rate at which that work is done.
What is the unit of work?
The SI unit of work is joule (J). Joule is defined as the work done by a force of one newton causing a displacement of one meter. Sometimes, newton-metre (N-m) is also used for measuring work.
What is the SI unit of force?
The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg.
What unit is energy?
Joule (J). This is the basic energy unit of the metric system, or in a later more comprehensive formulation, the International System of Units (SI).
What is power explain?
We can define power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines is given in terms of Horsepower (hp), which is approximately equal to 745.7 watts.
What is Ohm’s law rule?
Ohm’s Law Equation : V = IR, where V is the voltage across the conductor, I is the current flowing through the conductor and R is the resistance provided by the conductor to the flow of current.
What is the simple formula for power?
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 is power * time?
Definition. Power is the rate with respect to time at which work is done; it is the time derivative of work: where P is power, W is work, and t is time. If a constant force F is applied throughout a distance x, the work done is defined as .
How do you solve power in physics example?
Is work a form of energy?
Work is a form of energy. A Watt is the standard metric unit of work. Units of work would be equivalent to a Newton times a meter.
Is work done energy?
Work done has the same units as energy – joules. This is because energy is the ability to do work. So you must have energy to do work.
What is output power?
Power Output means the average rate of electric energy delivery during one Metering Interval, converted to an hourly rate of electric energy delivery, in kWh per hour, that is equal to the product of Metered Energy for one Metering Interval, in kWh per Metering Interval, times the number of Metering Intervals in a one- …
How do I calculate voltage?
- To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
- To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
- To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
- To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)
What is this power factor?
Power factor (PF) is the ratio of working power, measured in kilowatts (kW), to apparent power, measured in kilovolt amperes (kVA). Apparent power, also known as demand, is the measure of the amount of power used to run machinery and equipment during a certain period. It is found by multiplying (kVA = V x A).
How many formulas are there for work?
The three main equations representing the relationships between energy, work, and force.
What is work done by force?
The work done by a force can be defined as the product of the displacement of an object and the component of the applied force which is in the direction of the object’s displacement.