I need help plz!

Question

A car radio draws 0.35 A of current in the auto's 12-V electrical system.

(a) How much electric power does the radio use?

(b) What is the effective resistance of the radio?

Answer 1

Hello! I would be more than happy to answer this question.

For part A, we can use the electric power equation: P = IV with I being current and V being volts.

Plugging in, we get P = .35*12, giving us a total of 4.2 Watts.

For part B, since we know the current and voltage, we can easily obtain the resistance using the formula: R = V/I. This gives us about 34 ohms.