question

An ac generator has emf E = E m sin(?dt – p/4), where Em= 30.0 V and ?d = 350 rad/s. The current produced in a connected circuit is i(t) = I sin(?dt – 3p/4), where I = 620 mA. At what time after t = 0 does (a) the generator emf first reach a maximum and (b) the current first reach a maximum? (c) The circuit contains a single element other than the generator. Is it a capacitor, an inductor, or a resistor? Justify your answer. (d) What is the value of the capacitance, inductance, or resistance, as the case may be?
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