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How much current does a 300.0 W device draw when 12 V is placed across it? O 4.2 × 10² A O 3.6 × 10ª A 2 O 4.0 × 10¯ A O 2.5 x 10' A

How much current does a 300.0 W device draw when 12 V is placed across it? O 4.2 × 10² A O 3.6 × 10ª A 2 O 4.0 × 10¯ A O 2.5 x 10' A

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
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How much current does a 300.0 W device draw when 12 V is placed across it?

**Quiz Question: Calculating Current** **Question:** How much current does a 300.0 W device draw when 12 V is placed across it? **Answer Choices:** - ○ \( 4.2 \times 10^2 \) A - ○ \( 3.6 \times 10^4 \) A - ○ \( 4.0 \times 10^{-2} \) A - ○ \( 2.5 \times 10^1 \) A **Explanation:** To determine the current drawn by an electrical device, you can use the formula derived from Ohm's Law and the power equation: \[ P = V \times I \] Where: - \( P \) is the power (300.0 W) - \( V \) is the voltage (12 V) - \( I \) is the current Rearranging the formula to solve for current \( I \): \[ I = \frac{P}{V} \] Substituting in the given values: \[ I = \frac{300.0 \, \text{W}}{12 \, \text{V}} = 25 \, \text{A} \] Therefore, the correct answer is: - ○ \( 2.5 \times 10^1 \) A
Transcribed Image Text:**Quiz Question: Calculating Current** **Question:** How much current does a 300.0 W device draw when 12 V is placed across it? **Answer Choices:** - ○ \( 4.2 \times 10^2 \) A - ○ \( 3.6 \times 10^4 \) A - ○ \( 4.0 \times 10^{-2} \) A - ○ \( 2.5 \times 10^1 \) A **Explanation:** To determine the current drawn by an electrical device, you can use the formula derived from Ohm's Law and the power equation: \[ P = V \times I \] Where: - \( P \) is the power (300.0 W) - \( V \) is the voltage (12 V) - \( I \) is the current Rearranging the formula to solve for current \( I \): \[ I = \frac{P}{V} \] Substituting in the given values: \[ I = \frac{300.0 \, \text{W}}{12 \, \text{V}} = 25 \, \text{A} \] Therefore, the correct answer is: - ○ \( 2.5 \times 10^1 \) A
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