Answer to Question #42025 in Electric Circuits for qwerty

Question #42025
The potential difference V and the current i flowing through an instrument in an ac circuit of frequency f are given by V = 5 cos t volts and I = 2 sin t amperes (where = 2f). The power dissipated in the instrument is - (1)Zero (2)10 W (3)5 W (4)2.5 W
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