For any circuit element, the power is equal to the voltage difference across the element multiplied by the current. By Ohm’s Law, V = IR, and so there are additional forms of the electric power formula for resistors. Power is measured in units of Watts (W), where a Watt is equal to a Joule per second (1 W = 1 J/s).
What is electric power formula?
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 (voltage) difference of V is P=QVt=IV P = QV t = IV , where Q is electric charge in coulombs, t is time in seconds, I is electric current in amperes, and V is electric …
Which is equal to electric power Mcq?
Explanation: Power is the energy per unit time. That is, P=E/t. If the unit of power in kW and the unit of time is an hour, then the unit of energy=unit of power*unit of time=kWh.
What is the power equal to?
In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity.
|SI unit||watt (W)|
|In SI base units||kg⋅m2⋅s−3|
|Derivations from other quantities||P = E/t P = F·v P = V·I P = τ·ω|
What is electric power called?
Denoted by P and measured using the SI unit of power is the watt or one joule per second. Electric power is commonly supplied by sources such as electric batteries and produced by electric generators.
Electric Power Definition.
|Scalar or Vector||Scalar Quantity|
What is electric power class 10th?
Rate at which electric energy is dissipated or consumed in a circuit is called Electric Power. P = VI = I2R = V2/R. SI unit of Power is Watt (W). 1 Watt power is consumed when 1 Ampere of current flows through a device at a potential difference of 1 Volt.
How do we calculate power?
Power equals work (J) divided by time (s). The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s). Power may be measured in a unit called the horsepower.
Is kWh a unit of power?
The main difference between kWh and kW is in what they measure. To put it simply, a kilowatt is a measure of power and a kilowatt-hour is a measure of energy; power is the rate at which something uses energy, and energy is the capacity to do work.
What is the value of R if the power in the circuit is 1000W?
R=V/I => R=80/10= 8A. This discussion on Find the value of R if the power in the circuit is 1000W.
What is the formula of power Class 10?
P = E/t: This formula is also called the mechanical power equation. Here E stands for energy in joule and t stands for time in seconds. This formula states that the consumption of energy per unit of time is called power.
Is work equal to power?
As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. Thus, a Watt is equivalent to a Joule/second. … Thus, the power of a machine is the work/time ratio for that particular machine. A car engine is an example of a machine that is given a power rating.
What is the value of 10?
The absolute value of 10 is 10.
What is the value of 10 power?
Thus, shown in long form, a power of 10 is the number 1 followed by n zeros, where n is the exponent and is greater than 0; for example, 106 is written 1,000,000. When n is less than 0, the power of 10 is the number 1 n places after the decimal point; for example, 10−2 is written 0.01.
What are the types of electric power?
There are three major types of electric power – active power, reactive power, and apparent power.
- Active Power: This type of electric power is also known as real power or actual power or true power. …
- Apparent Power: The apparent power is that which is not used very often or lies idle.
What is electrical watt?
A Watt is the unit of electrical power equal to one ampere under the pressure of one volt. One Watt is a small amount of power. … The power consumption of small devices is usually measured in Watts, and the power consumption of larger devices is measured in kilowatts (kW), or 1,000 Watts.
What is the SI unit of electric energy and electric power?
The SI unit of electrical energy is joule. The SI unit of electrical power is watt.