When you connect an unknown resistor across the terminals of a 1.50 V AAA batter

Question

When you connect an unknown resistor across the terminals of a 1.50 V AAA battery having negligible internal resistance, you measure a current of 17.1 mA flowing through it.
A. What is the resistance of this resistor?
B.If you now place the resistor across the terminals of a 12.9 V car battery having no internal resistance, how much current will flow?
C.You now put the resistor across the terminals of an unknown battery of negligible internal resistance and measure a current of 0.456 A flowing through it. What is the potential difference across the terminals of the battery?

Explanation / Answer

a) R = v/I = 1.50 / 17.1 x 10^-3 = 87.72 apprx

b) I = V/R = 12.9/ 87.72 = 0.147 A apprx

c) v = 87.72 ( 0.456) = 40 V apprx

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