Question

How electric power is related to electrical energy?

Answer 1

Hint: Electric Power: The rate at which a device changes electric current to another form of energy is called electric power. The SI unit for power is the watt. A watt equals 1 joule of energy per second. High wattages are often expressed in kilowatts, where 1 kilowatt equals 1000 watts.

Complete answer:
Electrical energy use depends on the power of the appliance and how long it is used. It can be calculated with this equation:
Electrical Energy = Power $\times$ Time
As we know as per ohm's law the relationship between the three components of electricity conduction is given as
$V=IR$
Where V is the applied voltage
I is the current flowing R is the resistance of the body
Now,
Heat or power produced by the circuit is given by
$P=I^{2}R$
$\because V=IR$
$\Rightarrow R={\displaystyle \frac{V}{I}}$
$\therefore P=I^2\times {\displaystyle \frac{V}{I}}$
$\Rightarrow P=IV$
So, by substituting the values we get
Electrical energy = $V\times I\times t$
We can write its as the electric energy is the amount of electric power consumed in a duration of time

Note:
1.The unit of power is watt which is $j{\sec }^{-1}$ and the unit of Energy is Joules so, power means the amount of heat produced per second
2.Electric power is the rate at which a device changes electric current to another form of energy. The SI unit of power is the watt. Electric power can be calculated as the current times' voltage.
3.Electrical energy use is typically expressed in kilowatt-hours
4.Ohm's law states that the applied voltage is directly proportional to the current flowing in the circuit.