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# I need it rn please :>

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A loudspeaker needs a household voltage of 110 V to push a current of 5 A through its coil. What is the resistance of the loudspeaker?

Oct 15, 2021

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A loudspeaker needs a household voltage of 110 V to push a current of 5 A through its coil. What is the resistance of the loudspeaker?

I assume that we're going to neglect the complexities of calculating alternating current versus direct current, and simply go with the standard formula of E = IR.  Voltage = Current x Resistance   They use E for voltage because it stands for Electromotive Force, but I don't know why they use I to represent current, maybe it's from Latin or something like that.  We're also going to neglect the inconvenient fact that it requires a varying direct current to drive a speaker.

E  =  IR

Since we're looking for resistance,

we want to isolate R on one side of

the equation, so divide both sides by I               R  =  E / I

Plug in the known values                                    R  =  110 / 5

R  =  5 Ω

.

Oct 15, 2021
#2
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Did somebody change this while I was asleep?  Or did I make a clumsy error?

R  =  110 / 5       obviously does not equal 5 sheesh can't believe I did that

R  =  22 Ohms

Guest Oct 16, 2021