On the other hand, if the circuit is purely resistive, that is, a configuration of resistors only connected to a battery; the source energy continually gets dessipated entirely in the form of heat. Please explain this line.
Answers
Answer:
First of all, we know that not all of the electric current we produce is transformed in doing useful work ( like rotating the blades of an electric fan , watching TV etc. ). The rest is transformed in the form of heat energy which increases the temperature of the gadget. This is called heating effects of electric current.
We often experience this in our everyday life !
For example---> The fan becomes warm when used continuously for a longer time etc. On the other hand, If the electric circuit is purely resistive, that is , a configuration of the resistors only connected to a battery ; the source energy gets dissipated entirely in the form of heat.
Consider a current flowing through a resistor of resistance R. Let the potential difference across it be V. Let, t be the time taken during which the charge Q flows across. The work done in moving the charge Q through a potential difference V is VQ . Hence, the power input to the circuit by the source is
P = V Q / t
i.e. P = V I
The names of two devices based on the effect of electric current are :-
Explanation: