Equation Of Power Current And Voltage

By multiplying the voltage in volts by the current in amps we arrive at an answer in watts let s apply this to a circuit example.

Equation of power current and voltage. Electric power like mechanical power is the rate of doing work measured in watts and represented by the letter p the term wattage is used colloquially to mean electric power in watts the electric power in watts produced by an electric current i consisting of a charge of q coulombs every t seconds passing through an electric potential difference of v is. The amp is quite large for electronics so we often measure current in milliamps ma and power in milliwatts mw. One ohm is defined as the resistance which allows the current of one ampere under a potential difference of 1 volt. Put your finger over v this leaves p over i so the equation is v p i.

Learn the power formula. To calculate current i. Current voltage and resistance current is the rate of flow of electric charge. How to use ohm s law to determine current.

In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. For any circuit element the power is equal to the voltage difference across the element multiplied by the current. To calculate voltage v. This formula can be used to substitute for the voltage or for the current in the power formula and the power output of a battery that has internal resistance can be found using the formula v ε ir and the formula for power.

Preview and details files included 1 docx 13 kb. A potential difference voltage across an electrical component is needed to make a current flow through it. By ohm s law v ir and so there are additional forms of the electric power formula for resistors. 1ma 0 001a and 1mw 0 001w.

The electrical relationships between resistance r current i power p and voltage e is defined by ohm s law. This calculator is based on simple ohm s law as we have already shared ohm s law p i v r calculator in which you can also calculate three phase current. They are power p or w measured in watts voltage v or e measured in volts current or amperage i measured in amps amperes and resistance r measured in ohms. Power is measured in units of watts w where a watt is equal to a joule per second 1 w 1 j s.

Power voltage current resistance p v i r calculator. The power used or dissipated by a resistor can be found using the formula v ir. We ve seen the formula for determining the power in an electric circuit. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.