Question

3}} Define Heating effect of electric current. State the cause behind it and also state the Joule's law about heating effect with proper mathematical form. loctrical geyser rated 1500 W. is connected to a 250 V ac mains​

Answer 1

Answer:

What is the expression for the electrical power spent in the flow of current through a conductor in terms of resistance and potential difference?

a. V2/R                 b.  V/R2

c. VR                     d. V2R

Sol: a. V2/R 

If a certain amount of dissipation of power happens for a given time, then energy is dissipated. Measurement of energy (power×time) happens in units of Joules and by including time (t) in the power formulae, the energy dissipation of a component or circuit can be calculated. Energy dissipation = Pt

or VI*t as P=VI.

When the time factor is ignored, the relationship is as follows:

P = V2/R as I = V/R

Hence, the expression for the electrical power spent in the flow of current through a conductor in terms of resistance and the potential difference is P = V2/R.