What is the formula of time and work?
What is the formula of time and work?
Important Time and Work Formula Work Done = Time Taken × Rate of Work. Rate of Work = 1 / Time Taken. If a piece of work is done in x number of days, then the work done in one day = 1/x. Total Wok Done = Number of Days × Efficiency.
What is the formula of efficiency?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C, where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
What is the formula of calculating percentage?
If we have to calculate percent of a number, divide the number by whole and multiply by 100. Hence, the percentage means, a part per hundred. The word per cent means per 100. It represented by the symbol “%”.
What is the rate of work?
The rate of doing work is equal to the rate of using energy since the force transfers one unit of energy when it does one unit of work. A horsepower is equal to 550 ft lb/s, and a kilowatt is 1000 watts.
How is treadmill work rate calculated?
The treadmill work rate was calculated with the formula WR = mass·g·v·sin (θ), where v is treadmill speed and θ is treadmill angle. The secondary outcomes were incremental exercise duration, the highest treadmill speed and slope and the number of subjects who reached their peak work rate within 8-12 min.
Is work same as power?
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 does force equal to?
According to NASA, this law states, “Force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration.” This is written in mathematical form as F = ma. F is force, m is mass and a is acceleration.
What does P IV mean?
instantaneous electrical power P
What does P mean in Ohm’s law?
Volts times Amps
What does P mean in circuits?
Electric power (P) is simply the product of current times voltage. Power has familiar units of watts. Since the SI unit for potential energy (PE) is the joule, power has units of joules per second, or watts. Thus, 1 A ⋅V= 1 W.
What is calculated with the equation P IV?
Recall that power is the rate work is done, or the rate at which energy is consumed or produced. In terms of current and voltage it is P=IV. It is equal to the integral of power over time. A common unit used to describe energy usage is the kilowatt-hour, the energy of 1000 W acting over one hour.
What is measured in Ohm?
The ohm is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the seat of any electromotive force.
How do I calculate kWh?
A kilowatt-hour, expressed as kWh or kW·h, is a measure of energy that is equivalent to 1,000 watts of power for a 1-hour time period. Thus, to convert watts to kilowatt-hours, multiply the power in watts by the number of hours, then divide by 1,000. For example: let’s find the kWh of 1,500 watts for 2.5 hours.
How do I calculate resistance?
If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.
What law is P IV?
Watt’s law
What is Watt’s law formula?
Watt’s Law states that: Power (in Watts) = Voltage (in Volts) x Current (in Amps) P = V I Combining with Ohm’s law we get two other useful forms: P = V*V / R and P = I*I*R Power is a measurement of the amount of work that can be done with the circuit, such as turning a motor or lighiting a light bulb.
What does the i stand for in the equation P i * V?
electrical current
What is Ohm’s law solved for current?
Ohm’s law formula The resistor’s current I in amps (A) is equal to the resistor’s voltage V in volts (V) divided by the resistance R in ohms (Ω): V is the voltage drop of the resistor, measured in Volts (V). In some cases Ohm’s law uses the letter E to represent voltage.
