A charge of $36 C$ passes through a circuit every $9 s$ . If the circuit can generate $4 W$ of power, what is the circuit's resistance?

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Answer 1 · 2017-04-28T06:42:47

The resistance is $=0.25Omega$

We need Ohm's Law

$U=RI$

We apply the following equations

The power is $P=UI=RI^2$

and

The charge is $Q=It$

So,

$I=Q/t=36/9=4A$

And

The resistance is $R=P/I^2=4/4^2=0.25Omega$

A charge of 36 C36 C passes through a circuit every 9 s9 s. If the circuit can generate 4 W4 W of power, what is the circuit's resistance?