Power output physics

Work has nothing to do with the amount of time that this force acts to cause the displacement. Sometimes, the work is done very quickly and other times the work is done rather slowly. For example, a rock climber takes an abnormally long time to elevate her . This set of problems targets your ability to use equations related to work and power , to calculate the kinetic, potential and total mechanical energy, and to use the work-energy relationship in order to determine the final spee stopping distance or final height of an object.

A secondary school revision resource for Edexcel GCSE Physics about generation and transmission of electricity.

The output power of an electric motor is the product of the torque that the motor generates and the angular velocity of its output shaft.

Revise how to calculate work done, gravitational potential energy and kinetic energy with BBC Bitesize GCSE Physics.

We can calculate the efficiency of an appliance in terms of either the energy conversion or in terms of the useful power input and output. This equation describes the percentage of total . The power output of electrical equipment such as light bulbs or stereos is typically advertised in watts. Power is the rate at which work is done.

I have no idea how to go further than this. Also, what is power abbreviated as? What is the total power put out by the speaker, in watts? The unit of power is the watt, which has the symbol W. Electrical appliances (TV sets, kettles and so on) have electrical rating plates on them. Shows how to calculate the average power output of the engine in an accelerating race car.

You can link to all my videos at my website: Link . The input and output powers can be used directly. This gives the alternative relationship for efficiency:efficiency = useful power output ÷ total power inputThe output power of . In many processes, work or energy is lost, for example as waste heat or vibration. A perfect process would have an efficiency of 1. A BBC Bitesize secondary school revision resource for Standard Grade Physics about resistance: electrical power , lamps and heaters, using electricity. If the expressions for electric potential difference and current are substituted into the power equation, two new equations can be derived that relate the power to the current and the resistance and to the electric potential difference and the resistance. Learn how dynamos generate power.

These derivations are shown below. Find out how to calculate voltage as well as input and output power with BBC Bitesize GCSE Physics. For safety reasons, the plant does not produce greater power at the high wind conditions than those for which it is designed.

During storms, the plant is switched . When electric companies determine how much to charge their clients, they measure the power output and the amount of time in which this power was generated. Note that the kilowatt- hour, as a .