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A current of 30 A is registered when the...

A current of `30 A` is registered when the terminals of a dry cell of EMF 1.5 VOLTS are connected through an ammeter. Neglecting the meter resistance, find the amount of heat produced in the battery in 10 seconds.

Text Solution

Verified by Experts

The current in the circuit will be
`I = epsilon/r`
or, `30A = (1.5V)/r` giving `r = 0.05 Omega`.
The amount of heat produced in the battery `i^2 rt = (30A)^2 xx (0.5 Omega) xx 10s = 450 J`.
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Knowledge Check

  • When a resistance of 2 Ohm is connected across the terminals of a cell, the current is 0.5 A. If a resistance of 5 Ohm is connected across the cell then the current is 0.25 At the emf of the cell is:

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