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Step-by-step Answer
PAGE: 94SET: ExercisesPROBLEM: 74
Please look in your text book for this problem Statement

Voltage used by an electrical device is , where is the voltage in volts, is the power in watts, and is the resistance in ohms.

The function .

(a)

Find power consumption of the lamp.

Voltage.

Resistance.

Solve for .

Consider .

.

Substitute the values of and in above equation.

watts.

The power consumption of the lamp is  watts.

(b)

Find the resistance of the DVD player.

Current .

Power watts.

Solve for .

Consider .

Substitute the values of and in above equation.

The resistance of the DVD player is .

(c)

Ohms law :

Ohms law states that the current through a conductor between two points is directly proportional to the potential difference across the two points.

Ohms law expresses voltage in terms of current and resistance. The two functions are  and .

Solve for .

Consider .

Substitute in equation (1).

 

(a) The power consumption of the lamp is  watts.

(b) The resistance of the DVD player is .

(c) .



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