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3 years ago

If the voltage across a 12 ohm resistor is 4.0 volts. the current through the resistor is?

Physics

1 answer:

Inga [223]3 years ago

5 0

Answer:

Current = 0.33 Amperes

Explanation:

Given the following data:

Resistance = 12 ohm

Voltage = 4 v

To find the current;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

Voltage = current * resistance

Substituting into the formula, we have;

4 = current * 12

Current = 4/12

Current = 0.33 Amperes

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How far must you be from a 110 W speaker to have an intensity of 0.0439 W/m^2? (Treat the speaker as a point source.)

Lina20 [59]

Answer:

$d=14.12m$

Explanation:

Assume a point sound source that emits a sound power P (in W) evenly in all directions of space. Let us also assume that the medium does not absorb this sound power when it passes through it. At a distance d from the source this power will have been evenly distributed over the surface of a sphere of radius d. Therefore, the acoustic intensity I at distance d will be worth:

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D) Less than 20.

Explanation:

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