$\"\"$

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

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The function $\"\"$ .

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(a)

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Find power consumption of the lamp.

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Voltage $\"\"$ .

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Resistance $\"\"$ .

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Solve for $\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute the values of $\"\"$ and $\"\"$ in above equation.

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$\"\"$

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$\"\"$ watts.

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The power consumption of the lamp is $\"\"$ watts.

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$\"\"$

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(b)

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Find the resistance of the DVD player.

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Current $\"\"$ .

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Power $\"\"$ watts.

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Solve for $\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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Substitute the values of $\"\"$ and $\"\"$ in above equation.

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$\"\"$

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The resistance of the DVD player is $\"\"$ .

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$\"\"$

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(c)

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Ohms law :

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

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$\"\"$

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

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Solve for $\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in equation (1).

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$\"\"$

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$\"\"$

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

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(b) The resistance of the DVD player is $\"\"$ .

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(c) $\"\"$ .