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A car radio draws 0.32 A of current in the auto's 12-V electrical system.(a) How much electric power does the radio use? _________W(b) What is the effective resistance of the radio? _________Ω

Sagot :

a)

The power is given by:

[tex]P=VI[/tex]

Where V is the voltage and I is the current.

In this case the voltage is 12 V and the current is 0.32, then we have:

[tex]\begin{gathered} P=(12)(0.32) \\ P=3.84 \end{gathered}[/tex]

Therefore, the power is 3.84 W

b)

Ohm's law states that:

[tex]R=\frac{V}{I}[/tex]

Then we have:

[tex]\begin{gathered} R=\frac{12}{0.32} \\ R=37.5 \end{gathered}[/tex]

Therefore, the resistance is 37.5 Ohms

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