Question

What is the heat generated by a current of 0.1 A in a wire of resistance 1000 in 42 seconds () = 4.2 J/cal)​

Answer 1

• Current=I=0.1A
• Resistance=R=1000ohm
• Time =42s

Using Joules law

$\boxed{\sf H=I^2Rt}$

$\\ \sf\longmapsto H=(0.1)^2\times 1000\times 42$

$\\ \sf\longmapsto H=0.01\times 42000$

$\\ \sf\longmapsto H=420J$