The relationship of power, resistance and voltage.

The power dissipated in a closed circuit is equal to the square of the voltage applied to the circuit divided by the circuit resistance.

The online calculator below allows you to find:
- Power through resistance and voltage;
- Voltage through power and resistance;
- Resistance through power and voltage.

Power, resistance and voltage are three main parameters in electrical circuits that are closely related. Current power determines the rate at which energy is transferred through a circuit, while resistance and voltage determine how energy is transferred through a circuit.

According to Ohm's law, the resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area. Mathematically, this is expressed by the formula R = ρ * l / A, where R is the resistance of the conductor, ρ is the resistivity of the conductor material, l is the length of the conductor, A is the cross-sectional area of the conductor.

The resistance of a conductor determines how much energy will be lost as heat when current flows through it. The higher the resistance of the conductor, the more energy will be lost as heat, and the less current will be transferred through the circuit.

The voltage applied to a circuit determines how much energy will be transferred through the circuit. The higher the voltage, the more energy will be transferred through the circuit, and the higher the current power.

The power of the current is calculated as the product of the current flowing through the conductor and the voltage applied to its ends. Mathematically, this is expressed by the formula P = I * V, where P is the current power, I is the current flowing through the conductor, V is the voltage applied to its ends.

It should be noted that current power can be lost as heat, especially when high resistance conductors are used. In such cases, some of the energy transmitted through the circuit is converted into heat, which can lead to overheating of the conductors and other problems.

In conclusion, power, resistance and voltage are closely related in electrical circuits. The resistance of a conductor determines how much energy will be lost as heat when current flows through it, the voltage determines how much energy will be transferred through the circuit, and the power of the current determines the rate at which energy is transferred through the circuit. When using electrical circuits, wattage, resistance, and voltage must be considered to avoid overheating and other problems associated with power loss as heat.
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