The formula for finding power in a DC...

The formula for finding power in a DC...

Question 1 of 27070

Q

The formula for finding power in a DC circuit when current and resistance are known:

A

P = IE

B

P = ( I Squared ) R

C

PF = W/IE

D

None of the above

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Question 1 / 270707Fzx5vBisQFFVivZCu3w

Question 1 of 270707Fzx5vBisQFFVivZCu3w

The formula for finding power in a DC circuit when current and resistance are known:

Question 1 of 27070

Study area:

Study area:

Q

The formula for finding power in a DC circuit when current and resistance are known:

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🔍 Key Concepts

• Ohm's Law relationships between voltage (E), current (I), and resistance (R) • Basic power formulas in DC circuits • How changing current affects power when resistance is constant

💭 Think About

• If you only know current (I) and resistance (R), which formulas actually use only those two quantities? • How can you rewrite the basic power formula using Ohm's Law so that voltage (E) is eliminated and only I and R remain? • Think about what happens to power if you double the current while resistance stays the same—does the correct formula match that behavior?

✅ Before You Answer

• Identify the standard power formula that uses voltage and current, then use Ohm’s Law to substitute for voltage (E). • Check which choice shows power increasing with the square of current when resistance is constant. • Make sure the formula you choose contains only I and R, since voltage (E) is not given.