Question

The water heating rod draws 10 A current when connected to certain power source. The resistance

of rod is 12 Ω. The source voltage is​

Answer 1

Given:

The water heating rod draws 10 A current when connected to certain power source. The resistance of rod is 12 Ω.

To find:

Value of Source Voltage.

Calculation:

Ohm's Law can be applied only when the temperature is considered to be constant.

Ohm's Law states that the current through a circuit is directly proportional to the the potential difference across its end.

Applying Ohm's Law :

$\rm{ \therefore \: resistance = \dfrac{voltage}{current} }$

$\rm{ = > \: 12 = \dfrac{voltage}{10} }$

$\rm{ = > \: voltage = 10 \times 12}$

$\rm{ = > \: voltage = 120 \: volt}$

Hence , final answer is :

Source Voltage is 120 Volts.