1. Four eight-ohm speakers are connected in parallel to an audio power amplifier
ID: 2080600 • Letter: 1
Question
1. Four eight-ohm speakers are connected in parallel to an audio power amplifier. The amplifier can supply a maximum drive output voltage of fifteen volts. How much audio power must the amplifier be able to deliver to the speakers when outputting this maximum voltage?
28 W
b.112.5 W
225 W
56 W
2. To determine the value of a resistor to place in shunt with a known resistor to obtain a certain value of the total parallel combination:
multiply the desired value by the known value, then divide this product by their difference.
b.subtract the known from the desired total.
c.add the desired to the known.
multiply the desired by the known, then divide this product by their sum.
a.28 W
b.112.5 W
c.225 W
d.56 W
Explanation / Answer
1) Power=(V*V)/R
where R is equivalent resistant i.e., R=8||8||8||8 = 2 ohms
V=15 volts
Power=(15*15)/2=225/2=112.5 watts
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