I'm using a TI-84 plus calculator and for some reason my answer comes out different than what it should. (Find the equivalent resistance in the circuit shown above, which is R1= 11 ohms, R2= 7.00 ohms E- 50.0 V) What do I do?
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Unless you give us a visual, we can't tell if the resistances you mentioned are in series or parallel.
If they're in series, then the equivalent resistance is just the sum of the resistances.
If they're in parallel, then the equivalent resistance is 1/[1/R1 + 1/R2].
If they're in series, then the equivalent resistance is just the sum of the resistances.
If they're in parallel, then the equivalent resistance is 1/[1/R1 + 1/R2].