Question:

Can someone answer these Electronic Questions?

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I hate maths. So I can't quite grasp the right answer for these questions, and since my Electronics lecturer is an *** and won't point me in the right direction... Can someone please answer:

This:

An amplifier delivers a power of 16W into a 4 Ohm speaker when the input is driven by a signal of 800mV RMS.

Evaluate the RMS Voltage across the speaker

Evaluate the gain of the amplifier in dB.

And this please:

A sinusoidal voltage source with a peak value of 50V is applied to a resistive load of 10 Ohms. Calculate the power in the load.

They're doing my head in. Can you also include how oy uwork em out, so I can see if I can repeat the results? Thanks.

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  1. An amplifier delivers a power of 16W into a 4 Ohm speaker when the input is driven by a signal of 800mV RMS.

    Evaluate the RMS Voltage across the speaker

    Evaluate the gain of the amplifier in dB.

    P = E²/R

    16 = E²/4

    E = √(4*16) = 8 volts RMS

    Gain of amp is therefore 8/0.8 = 10

    Gain in db = 20log10 = 20db

    A sinusoidal voltage source with a peak value of 50V is applied to a resistive load of 10 Ohms. Calculate the power in the load.

    50 volts peak is 50*0.7 volts RMS = 35 volts RMS

    P = E²/R

    P = 35²/10 = 122 watts

    .


  2. Speaker voltage = (WR)^0.5 = 8 V rms

    Voltage Gain = 8000mv/800mv = 10

    in Db = 20 *log 10 = 20 Db  voltage gain.

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