How to work out power output

The unit of power is the watt (W). You can work out power using this equation: Power is equal to energy divided by time. Divide joules by seconds to find watts. A secondary school revision resource for OCR Gateway Additional GCSE Science about weight, mass, work and power.

What is the power if the voltage is 12V and the current is 5A?

The power of an electrical appliance can be calculated from the current that flows through it and the potential difference across it.

The standard metric unit of power is the Watt.

Thus, a Watt is equivalent to a. It can be assumed that Ben must . We can calculate the amount of electrical energy transferred by an appliance and how much it costs to run. Note that power is measured in kilowatts here instead of the more usual watts. Power , current and potential difference. Assuming that the transformer is 1 efficient ( no energy is lost between its primary coil and secondary coil), the power output from the secondary coil will be the same as the power input to the primary coil.

It is operated from the mains supply. You should know that the mains supply is 2volts - did you? Now that we know the current, we can take that value and multiply it by the voltage to determine power. All you need to know is the number of amperes ( amps) and . Electrical power comes in AC and DC currents. DC means direct current, and it means the current only travels in one direction.

One of the best measures of athletic ability is power output during exercise. The power output of yourself or these things can be measured to see how much work you are actually doing. Stationary rowing full- out 3watts. Tour de France cyclist constant . Energy cannot be created or destroyed.

The amount of mains electrical energy . When work is converted to different forms of energy you can use the work done relationship to calculate energy gained or lost, and energy relationships to calculate work done. This equation describes the percentage of total . Learn how dynamos generate power. Find out how to calculate voltage as well as input and output power with BBC Bitesize GCSE Physics.

Revise how to calculate work done, gravitational potential energy and kinetic energy with BBC Bitesize GCSE Physics. In many processes, work or energy is lost, for example as waste heat or vibration. A perfect process would have an efficiency of 1. Shows how to calculate the average power output of the engine in an accelerating race car.

Energy is what is used to do work and is measured in kilowatt-hours (kWh) or megawatt-hours (MWh). Now you are ready to calculate the hydropower power: .