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Learn about power as the rate of doing work, and how to calculate it using the formula P = W / t. Find out the unit of power, watt, and the difference between instantaneous and average power with examples and FAQs.
- 67 min
- 1486
- What Is Power?
- Power Formulas
- Units of Power
- How Do We Measure Power?
- What Is Horsepower?
- Average Power
- Mechanical Power
- Electrical Power
- Calculating Power and Energy Consumption
- Solved Examples on Power
Power is a physical quantity that is a measure of energy transfer rate. Therefore, it can be defined as the rate at which work is done with respect to time. Hence, Power is the amount of energy consumed per second. Power can also be defined as the quantity of force required to cause a unit displacement.Power is a scalar quantity and is denoted by P...
Power is defined as the time rate ofwork doneby the object, then, mathematically this can be given by the power formula: Hence, the above relation of Power is calledthe work-time equation Work done (W) by an object can be defined as the product of force and the displacement of the object, then the power formula in terms of force is given by- Theref...
The SI unit of Power is Watt (W) whose multiples are, KW, MW, GW, and Others.Another unit of power is Horsepower (hp), where 1 hp = 746 WDimensional Formula for Power is [ML2T-3]Power is measured in various units and the SI unit for measuring power is the ‘watt’ represented by the symbol (W). It was named after Scottish scientist James Wattwho first came up with the idea of measuring power. Power is calculated using the formula, Power can also be measured in Joule/sec.
Interestingly as the name suggests horsepower does not have to do anything with horses it is the unit of measuring the power of any machine or engine.It is denoted by ‘hp’. It is mathematically equal to, Generally, the horsepower or hpis used to measure the power output of the engines of cars and bikes. The following image shows the power in Horsep...
Average Poweris defined as the ratio of the net (Total) work done in the total amount of time. Thus average power is given as, In case when the rate of work done by the body is uniform or constant then the average and instantaneous power become equal.
Inmechanical systems, the sum of forces and motion is known as power. Power is generally the product of a force acting on an object multiplied by its velocity, or the result of torque acting on a shaft multiplied by its angular velocity. The time derivative of work is another way to define mechanical power. Hence, the mechanical power is given by.
The rate at which energy is changed from the electrical energyof moving charges to another form, expressed as a rate, per unit of time, is known as electric power. Mathematically, electric power is defined as the product voltage and the current flowing, given as:
The power and energy consumption are measured by a formula. According to this, multiplying the number of power units consumed within the period over which it has been consumed gives it energy consumption. For more detail, Commercial Unit of Electrical Energy Hence, the energy consumption formula or the power consumption formula can be stated as: Al...
Example 1: A boy pushes a box of 20 kg up to a distance of 5 m for 10 seconds. Calculate the power delivered to the box. Solution: Example 2: A pump is required to lift 500 kg of water per minute from an 8 m deep well and eject it with a speed of 25 m/s. Calculate the power of the pump. Solution: Example 3: An elevator is designed to lift a load of...
- 4 min
It is a measure of the rate at which work is done (or similarly, at which energy is transferred). The ability to accurately measure power was one of the key abilities which allowed early engineers to develop the steam engines which drove the industrial revolution.
- V= instantaneous velocity; Since acceleration and velocity are in the same equation, then the velocity is changing (accelerating) over time, so it...
- If you know how much energy is being converted per unit time, that is all you need to calculate power. Ex. measure the current from the battery in...
- Vinitial is 0, therefore it is 1/2Vfinal
- Hello Alex, In general I would agree. In both cases you end up with joules / time. Watch out for context. It seems each field of study has it's own...
- Area under a power vs. time graph is the equivalent of integrating power with respect to time, which gives work or change in energy. To find averag...
- This is actually a very good way to think about it. Its good to know equations sometimes, but you just solved a rather tricky problem in a very ele...
In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. Power is a scalar quantity.
Jun 21, 2024 · Power, in science and engineering, time rate of doing work or delivering energy, expressible as the amount of work done W, or energy transferred, divided by the time interval t—or W/t. A given amount of work can be done by a low-powered motor in a long time or by a high-powered motor in a short.
- The Editors of Encyclopaedia Britannica
In physics, power is defined as the rate at which work is done. In other words, it measures how quickly energy is being transferred or transformed. Explore the concept of power in physics through an example of two weightlifters, one who lifts faster than the other, to see that power measures the rate at which work is done.
- 6 min
- David SantoPietro
Learn the various meanings and uses of the word power as a noun, verb, and adjective. Find synonyms, examples, etymology, and related phrases for power.
