The time constant of an RC circuit is 5.0 s. How much time t is required for the

Question

The time constant of an RC circuit is 5.0 s. How much time t is required for the capacitor (uncharged initially) equilibrium charge? t = Number^+1Units Significant digits are disabled; notolerance The heating element In an iron has a resistance 32 Ohm The iron is plugged into a 120-v outlet, what Is the power, dissipated by the iron? I Number^+1 Units signeficant digits are disabled; notolerance The average power used by a stereo speaker is 50 w. Assuing that the speaker can be treated as a 5.3 Ohm value of the ac voltage applied to the speaker. Number^+1 Units Significant digits are disabled; notolerance

Explanation / Answer

13)

P = power
I = current
E = voltage
R = resistance
P = IE
E = IR, I = E/R, substitute for I
P = (E/R)E

P = E^2/R
P = (120*120)/32
P = 14400/32
P = 450 watts

14)

p = v x v/r

p = v^2 / r

v(ave) = sqrt(p x r)

v(ave) = sqrt(50 x 5.3)

v(ave) = 16.28 v

v(peak) = v(ave)*sqrt(2)

v(peak) = 23 v

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