By taking the voltage and multiplying it by the associated current, the power can be determined. A watt (W) is a unit of power defined as one Joule per second. For a dc source the calculation is simply the voltage times the current: W = V x A.
How do you calculate input power?
Input and output power
- Electrical power is calculated by multiplying voltage (in volts) by current (in amps).
- If a transformer is 100% efficient, then the input power will equal the output power. …
- V P is input (primary) voltage.
- I p is input (primary) current.
- V s is output (secondary) voltage.
What is the input power?
Input refers to the amount of energy put into a device, and output refers to the amount of energy that comes out. A device may change the type of energy but not the amount. For example, a light bulb’s input energy is the form of electrical energy, and its output energy is in the form of light and heat.
How do you find the current input?
The factors that determine input current are output power, input voltage, and converter efficiency. Power = Voltage x Current. Efficiency = Power Out / Power In.
Is a motor input or output?
Output
| Output device | Function | Use |
|---|---|---|
| Motor | Converts power into rotary motion that can turn a spindle linked to gears or wheels to make them move | Cars and trains |
| Light-emitting diode (LED) | A long-lasting, low-power light | Torches, lamps and power indicators |
What does motor output mean?
In psychology, denoting the organism’s overt reaction to a stimulus (motor response).
How do you find power?
Power is equal to work divided by time. In this example, P = 9000 J /60 s = 150 W .