If you are an electrical engineer in a reputed firm and your task is to assess how many 450-watts bulbs you can use in one meeting room. We get the same power in a circuit when we use any of the three formulas of the watts law. Now we can say power is the product of current and voltage. We will deduct three formulas of ohm’s law. Here Ohm’s law will help us as it states the relationship between current voltages and resistance. But first, we need the current value of our circuit in order to get power. Now we are going to calculate power from the above 3 formulas. Now we have one more for power calculation. Power is directly proportional to voltages and current according to the above formula. We can see as the source voltage goes up or current goes up, then according to the mathematical formulas of Power, it’ll increase. Here V and E stand for voltages and I stand for current. We have the following voltages, current, and power formulas: “Watt’s law also states that power is equivalent to the product of voltage and current in a circuit.” We will use these two values for upcoming calculations. We have an electric circuit that has one voltage source and one resistance, as you see in the circuit diagram mentioned below: Let’s understand an example for a better idea! Examples of Power Calculation using Watts Law The formula for Watts law shows the relationships between power (watts), current (amps), and voltage(volt). We also use an electric circuit’s resistance to calculate power, voltage, and current. Watt’s law is defined as a “mathematical relationship between the electric parameters called voltage, current, and power”. Let’s go into its detail! What is Watts Law? We are going to discuss Watt’s law in this article. The ratio of the real to the apparent power is called power factor, and their value lies between 0 and 1.Watts’s law and Ohm’s law describe the relationship between a circuit’s voltage, current, resistance, and power consumption. The relation between the apparent, active and reactive power is shown below. Reactive Power – The power developed in the circuit reactance is called reactive power (Q). Φ – impedance phase angle between voltage and current.ģ. Active Power – The active power (P) is the real power which is dissipated in the circuit resistance. I rms – RMS current = I peak√2 in the amp.Ģ. It is represented by the symbol S, and their SI unit is volt-amp. Apparent Power – The apparent power is the useless power or idle power. They are the apparent power, active power and real power.ġ. The AC power is mainly classified into three types. It is produced by the fuel cell, battery and generator. The DC power is defined as the product of the voltage and current. The electrical power is mainly classified into two types. If, Thus, the power consumed in an electrical circuit is said to one watt if one ampere current flows through the circuit when a potential difference of 1 volt is applied across it.The bigger unit of electrical power is the kilowatt (kW), it is usually used in the power system Types of an Electric Power Where V is the voltage in volts, I is the current in amperes, R is the resistance offered by the powered devices, T is the time in seconds and the P is the power measured in watts. The electric power is given by the equation shown below. The utility of power is measured by the electric meter which records the total energy consumed by the powered devices. The electric power is sold regarding joule which is the product of the power in kilowatts and the running time of the machinery in hours. The classification of the electric power depends on the nature of the current. The electric power is divided into two types, i.e., the AC power and the DC power.
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