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# Consider the circuit shown in (Figure 1). Suppose that ΔV = 7.5 V. What is the value of resistor R?

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- husoskiLv 71 month ago
Ohm's law "E = IR" translates to:

7.5 = (0.100)(10 + 15 + R) . . . . in volt, amp, ohm units

75 = 25 + R

R = 50 (ohms)

The important step was to write I in ampere units instead of mA, to get units in a syste where there's no coefficient needed for Ohm's law. You could also use (mV, mA, ohms) or (volt, mA, K-ohms) as common choices.

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