measured in amps, represents how fast the energy moves through a circuit. For example, you might use horsepower and voltage to find the current in a motor. In order to calculate the current from the horsepower and voltage, you must also know the efficiency of the circuit...
Multiply the number of kVA by 0.001 to convert to MVA. In this example, multiply 438 by 0.001 to get 0.438 MVA. Check your answer on a calculator by entering the amount of kVA, pushing the division sign, entering "1,000" and pushing the equals sign....
Calculate the CT ratio. The CT ratio is the inverse of the voltage ratio. In this example, the voltage ratio is 1:5, so the CT ratio is 5:1. This means the current level is stepped down 5 times where, if the primary current is 200 amps, the CT output is 40 amps. References Pow...
The watts equation for an electrical circuit takes into account the voltage across the circuit V, measured in volts, and the current I, measured in amps, passing through it. In mechanics, the definition of power is the rate of doing work W. It's defined as W...
Find the voltage of your power source as you would when calculating from watts and volts. Ohm’s law states that the voltage equals the amperage times the resistance, so if you divide the voltage of your power source by the resistance of the load, you will find the amps. For example, ...
Voltage is used when referring to electricity. Devices that require electricity have a written note that indicates the voltage required and whether it's direct current (DC) or alternate current (AC). Most of the times, devices come with adapters that all
and even music use something called pulse width modulation or PWM to control the duty cycle and the necessary applied power (which can be referred to as input voltage or current). The duty factor plays a key role in representing the ratio of on time and off time for a given power supply...
Add up the total current in amps for the first column and the watts or volt/amps in the second column. The sums equal the transformer load expressed in the three terms. Identification A basic transformer changes high-input voltage, which comes from a power plant, to a lower voltage that ...
The voltage of a battery represents the force that makes electrons flow through a current in an electrical circuit. It measures potential energy, which is the amount of energy available to move electrons from one point to another in the circuit. The actual flow of the electrons through the cir...
Power up the power supply to the primary voltage level of the transformer. Note and record the amperes registered on the ammeter. Call this value "I," and assume, as an example, that it equals 65 amps. Calculate the VA rating using the formula "VArating = (Vsecondary x I)/0.8," whe...