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, i...
Volt amperes are a unit used to describe the electrical load in engineering. Volt amperes can be abbreviated VA. You can also use metric prefixes such as "kilo-" and "mega-." It takes 1,000 volt amperes to equal one kilo-volt ampere and 1,000,000 volt amperes to equal one mega-volt...
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...
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 number of amps a device draws when you use it for an hour. It’s expressed with the abbreviation “Ah.” Amp-hours is not a measurement of energy, but rather a measurement of charge. Because voltage is not included in an amp-hour, you cannot calculate energy from amp-hours alone....
where: Q is electric charge in coulombs, t is time in seconds, I is electric current in amperes and V is electric potential or voltage in volts Electric Energy Electrical Energy = Power x Time. The total amount of electrical energy used depends on the total power used by all your electri...
Calculating Resistance from Current and Voltage Write down all of the information that the problem gives you. Most simple physics problems that ask you to calculate resistance give you values for current and the voltage in the problem. Convert all of the units in the problem to volts and ampere...
You can also express your result in kilowatts (kw). The kilowatt formula is 1 kw = 1,000 watts. Watts as Units of Electrical Power The power formula for a circuit with a voltage V and current I is P = V × I ...
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 ...
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...