Question

240j is heat in a counductor of resistance 20ohm for 3 seconds .find amount of electric current​

Answer 1

AnswEr :

• Heat Energy (H) = 240 J
• Resistance (R) = 20 Ohms
• Time (t) = 3s

Heat Energy : Work Done stored in the form of heat, or when a current is moving in a conductor it develops a heat and that energy released in the form of heat is heat energy.

$\longrightarrow \tt{H\ =\ I^2 Rt} \\ \\ \\ \longrightarrow \tt{240\ =\ I^2\ \times\ 20\ \times\ 3} \\ \\ \\ \longrightarrow \tt{I^2\ =\ \dfrac{240}{20\ \times\ 3}} \\ \\ \\ \longrightarrow \tt{I^2\ =\ \dfrac{\cancel{240}}{\cancel{60}}} \\ \\ \\ \longrightarrow \tt{I^2\ =\ 4} \\ \\ \\ \longrightarrow \tt{I\ =\ \sqrt{4}} \\ \\ \\ \large \longrightarrow \underline{\boxed{\mathfrak{Current\ =\ 2\ A}}}$