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Writer's picturekeshprad

PhysicsBowl 2019 Q47


47) This is a question including concepts of circuits and current. First, the question tells us how much current is produced by the voltage source when two identical resistors are in series. Let's just give variable names to the resistance and voltage.

By drawing out the first situation, we can use that and Ohm's law to come up with an expression for current.

Where V is voltage, I is current, and R is resistance

Next, if we use the same variables V and R for the situation in parallel, we can find out the current in the second situation.

Where V is voltage, I is current, and R is resistance

Answer: E

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