A 32 mF capacitor has initial voltage of 19 VThe energy stor

A 3.2 mF capacitor has initial voltage of 19 V.The energy stored in the capacitor is used to light up a 0.4 kOhm lamp. How much will be the lamp\'s power 2.1 sec after the switch has been turned on?(unit:W)

Solution

capacitance of the capacitor(C)=3.2x10^-3_F

_{Voltage (V)=19 V;}

_{energy stored in the capacitor (u)= 1/2 CV²}

^{_{time(t)=2.1 sec}}

^{_{power=workdone/time}}

^{_{P=U/t watts}}