We make it easy for you to get started with our online e-learning platform. With Noon Academy, you can learn anytime and anywhere. In conclusion, power is a measure of the work that can be done by a force in a given amount of time. Power is a function of Work done, therefore. In earlier studies, power is sometimes called Activity. In the SI system (or International System of Units), Watt (W) is the unit of Power. Additionally, power is used to calculate the efficiency of machines and other devices. Power in Physics is defined as the time rate of the amount of energy converted or transferred. It is also used to determine how fast a certain amount of work can be done. It is used to calculate the amount of work that can be done by a force in a given amount of time. So the more powerful a device is, the more energy it will transfer each second. The concept of power is fundamental in physics. at which this energy is transferred is called power. How Does The Concept Of Power Help In Physics? Equations given in the exam change in thermal energy mass × specific heat capacity × temperature. – Velocity is measured in meters per second (m/s) Thus, equation above tells us that electric power is voltage times current, or. Power (W) = force (N) x distance (m) / time (s) But a Coulomb per second (C/s) is an electric current, which we can see from the definition of electric current, I Q t, where Q is the charge in coulombs and t is time in seconds. It is important to note that power is a rate, so it is measured in watts (W), which are equal to joules per second (J/s). The faster they could do the work, the higher their power output would be. If they could do the same work in just 1 second, their power output would be: We can insert these definitions into the equation for power: Electrical power is the product of voltage times current. Current is the rate of flow of charge, and voltage measures the energy transferred per unit of charge. For any circuit element, the power is equal to the voltage difference across the element multiplied by the current. For example, if you lift an object up, the distance is not just the height you lift it but also the horizontal distance you move it.įor example, if someone can lift a 200 N weight over a distance of 2 m in 5 seconds, their power output would be: An electric circuit is capable of transferring power. This formula is more useful when calculating the power of something that is not moving in a straight line. The formula for power can also be written as: The Ohms law formula can be used to calculate the resistance as the quotient of the voltage and current. Therefore, the power of the car is 1000 watts or 1 kilowatt. The time it took to travel that distance is 1 second. The distance the car has traveled is 10 m. This gives an alternative way of calculating power in. Therefore, in case of a three system, the average power and instantaneous power are same.For example, let’s say you want to find the power of a car that is moving at a speed of 10 m/s. The expression (F × s) t, representing work done time taken is also equal to force × velocity. The instantaneous power in an AC circuit is defined as the product of instantaneous voltage (v) across the element and instantaneous current (i) through the element and is denoted by lower case letter p.
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