Electric Current and Circuits Unit

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4 Comments

khalif muhammad • 3 years, 7 months agologin to reply

Electric Current and Circuits Test v1 #8 - I think the answers have the wrong units

Yuriy Zavorotniy • 3 years, 7 months agologin to reply

Khalif, Thank you. It is fixed. Yuriy

Daniel Watkins • 8 months, 1 week agologin to reply

I'm confused why the answer to number #29 in the Multiple Choice problem set is (A). Thank you : )

John Ennis • 8 months, 1 week agologin to reply

Daniel, the key is the word "steady." That means a constant power dissipation. So any circuit with a capacitor will have a varying current as the capacitor charges up. That rules out the RC circuits. Now, Power = V^2/R. All circuits have a constant V from the battery. We need to look for the circuit with the smallest resistance to maximize power. That would be (A) because the resistors are in parallel and the equiv resistance is R/3. (B) has an equiv resistance of 3R. John

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