In physics, electric power measures the rate of electrical energy transfer by an electric circuit per unit of time. Denoted by P and measured using the SI unit of power which is watt or one joule per second. Electric power is commonly supplied by electric batteries and produced by electric generators.
Electric power is the rate at which work is done or energy is transformed into an electrical circuit. Simply put, it is a measure of how much energy is used in a span of time.
V is the potential difference in the circuit.
I is the electric current.
The above two expressions are obtained by using Ohm’s law, Where, voltage, current, and resistance are related by the following relation:
V = IR
Where,
Since power is the rate of energy consumption, energy can directly be calculated using
E is the energy consumption (in Joules)
t is the time in seconds
Based on the information given above, try the application problem given below:
A 9V battery is connected to a resistor having a resistance of 10 Ω. What is the current and power across the resistor?
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Electric power is defined as the power dissipated by an electric circuit. Electric power is a measurement of the rate at which energy is used over a period of time. The SI unit for power is the watt, the unit for energy is the joule, and the unit for time is the second.
For a direct current circuit, electric power equals the electric current multiplied by the voltage.
When electric current flows through a circuit, it is slowed down by the resistance in the circuit. Devices can convert this current to useful forms of work, such as heat radiation, light emission, mechanical motion, or acoustic vibrations.
Electrical energy is an important concept in science, yet it is frequently misunderstood. So what exactly is electrical energy and what are some of the rules applied when it is used in calculations? In this article, let us find answers to these questions.
Electrical energy is the energy derived from electric potential energy or kinetic energy of the charged particles. In general, it is referred to as the energy that has been converted from electric potential energy. We can define electrical energy as the energy generated by the movement of electrons from one point to another. The movement of charged particles along/through a medium (say wire) constitute current or electricity.
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