Question

The current flow in a wire of resistance 5 ohm having potential difference 7 volt for 20 minute. heat produce will be

Answer 1

$Q=11760\ J$ is the heat produced in the wire.

Explanation:

Given:

• resistance of wire, $R=5\ \Omega$

• potential difference in the wire, $V=7\ V$

• time for which the current flows through the wire, $t=20\times 60=1200\ s$

From the Joule's Law of heating we have:

$Q=I^2.R.t$ ................................(1)

Now we find current :

$I=\frac{V}{R}$

$I=\frac{7}{5} \ A$

Now putting respective values in eq. (1)

$Q= (\frac{7}{5} )^2\times 5\times 1200$

$Q=11760\ J$

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TOPIC: Joule Heating

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