A current waveform, i(t), shown in the figure, is passed through a Permanent Magnet Moving Coil (PMMC) type ammeter. The reading of the ammeter up to two decimal places is

PMMC instrument reads average value, So the value of AMMETER = average value of given wave formTime period = 2 msLet consider the WAVEFORM for one TIME periodAverage value \(\FRAC{1}{T}\mathop \smallint \limits_0^T i\left( t \right)\;dt\)\(= \frac{1}{{2 \times {{10}^{ - 3}}}}\left[ {\mathop \smallint \limits_0^{1 \times {{10}^{ - 3}}} tdt + \mathop \smallint \limits_{1 \times {{10}^{ - 3}}}^{2 \times {{10}^{ - 3}}} - 1dt} \right]\)\(= \frac{1}{{2 \times {{10}^{ - 3}}}}\left[ {\frac{{1 \times {{10}^{ - 3}}}}{2} + \left( { - 1} \right)\left( {2 - 1} \right)\left( {{{10}^{ - 3}}} \right)} \right]\)\(= \frac{1}{2}\left[ {\frac{1}{2} - 1} \right] = \frac{{ - 1}}{4}A =- 0.25\;A\)