Joule's Law - SSLC physics effects of electric current

In the previous section we have derived equation for heat energy produced . Joule's Law is the explanation of that heat energy produced equation . It gives relation between  heat energy ,current resistance and time.We can state Joule's Law as

                 

• That is , if current through the conductor increases ,then the heat produces will also increase.
• Similarly at constant voltage and time , if we increase Resistance, heat energy will also increase.
• same case will happen if we increase the time for flowing the current through the current.

The numerical problems required for this section , we will discuss in separate page.Now let's discuss about Electric power.

Electrical Power

You might have seen in electrical appliances the marking of 50 W, 9 W, 60 W etc . This term is indicating the power . It gives you the idea of how much energy it has consumed in unit time. So we can define Electric power as
" The amount of energy consumed by an appliance in unit time is its power "
We have studied earlier in this chapter that energy produced is the work done to move charge from one point to another. So we can make equation for power.



Here the energy is produced as heat . So,

And we will get other forms of equation by substituting I, R by Ohm's law equation ( V = I R)
So , we will get




And similarly,







So equations of power are



You can also refer the equations of heat energy produced and you can compare the equations.