# What is electric power derive its expression and derive its unit class 10th?

The rate at which electric energy is dissipated or consumed in an electric circuit is called electric power. It’s SI unit is Watt (W). power = work done / time taken. we know that work done by current I when it flows for time T under potential difference V is given by : W = V*I*T joules.

• P = E t.
• P = W t.
• P = V 2 R.

## What is the derivation of power?

Derivation of Dimensional Formula for Power = M1 L2 T-3. This is why the dimensional formula of power is represented as M1 L2 T-3.

## What is the SI unit of power?

unit of power is watt (W). When a body does work at the rate of 1 joule per second, its power is 1 watt.

## What is the SI unit of energy?

The SI unit of energyunit of energyThe SI unit of work is the joule (J). It is defined as the work done by a force of one newton through a distance of one metre.https://byjus.com › state-and-define-the-s-i-unit-of-workState and define the S.I. unit of work. – Byjus is same as that of work, which is joule (J).

## What is Ohm’s law rule?

Ohm’s Law Equation : V = IR, where V is the voltage across the conductor, I is the current flowing through the conductor and R is the resistance provided by the conductor to the flow of current.

## What is voltage drop formula?

Voltage drop of the circuit conductors can be determined by multiplying the current of the circuit by the total resistance of the circuit conductors: VD = I x R.

## How is DC current calculated?

P = V X I . Here P is power in watts. V is voltage in volts. I is current in amps.

## What is formula of work done?

To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.

## What is resistivity formula?

See all related content → Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. The unit of resistance is the ohm.

## What is the formula for displacement?

Displacement Formula Displacement = Final position – initial position = change in position.

## What is current formula?

Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm’s law is I = V/R.

## What formula defines watts law?

Watt’s law defines the relationship between power, voltage and current and states that the power in a circuit is a product of the voltage and the current. There are many practical applications of Watt’s law, and the formula to calculate Watt’s Law is P=IV.

## Which unit is joule?

4.1. The SI unit for work and energy commonly used in drawing is the joule (J), which is equivalent to a force of one newton exerted through a distance of one meter (m).

## Is KW a SI unit of power?

The SI unit of power is kilowatts.

## What is CGS unit of heat?

In the CGS system, heat is expressed in the unit of calories which is further said to be the heat energy needed to increase the temperature of 1 gm of clean water by one degree Celsius. Sometimes kilocalorie (kcal) is referred to as a unit of heat where 1 kcal = 1000 cal.

## Is joule CGS or MKS?

Unit of Energy in MKS System The MKS stands for meter-kilogram-second. 1 Joule is equivalent to one Newton-meter (N-m) where 1 J is the amount of work done by a newton of force to a distance of 1 meter.

## Is joule a SI unit?

joule, unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre.

## What are 3 common units of energy?

• Barrel of oil.
• Calorie.
• Horsepower.
• Joule (J)
• Kilowatt-hour (kWh)
• Kilowatt (kW)
• Megajoule (MJ)
• Megawatt (MW)

## What is meant by 1 ohm?

One ohm is equal to the resistance of a conductor through which a current of one ampere flows when a potential difference of one volt is applied to it.

## What is the unit of resistance?

The unit of the electrical resistance, measured with direct current, is the ohm (abbreviated Ω), named after the German physicist and mathematician Georg Simon Ohm (1789-1854).

## What is V in circuit?

Ohm’s Law is V = IR, where V = voltage, I = current, and R = resistance. Ohm’s Law allows you to determine characteristics of a circuit, such as how much current is flowing through it, if you know the voltage of the battery in the circuit and how much resistance is in the circuit.

## What is power factor in AC circuit?

Power factor is defined as the ratio of the average power in an ac circuit to the apparent power, which is the product of the voltage and current magnitudes. (1.77) Power factor (PF) has a value between zero and unity.

## How do I calculate wire size?

1. Multiply the resistivity (Ω•m) of the conductor material by the peak motor current (A), the number 1.25, and the total length of the cable (m).
2. Divide the result by the voltage drop from the power source to the motor.
3. Multiply by 1,000,000 to get the result in mm2.

## What is the other name of voltage?

Voltage, also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field.