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# exam7_firstpage(1) - R eq = R 1 R 2 R 3(b For resistances...

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Exam 7 Electric Circuits and Magnetism SAR Physics AM Kolchin 1. Ohm’s Law (relationship between voltage across, current through, and resistance between two points): V = IR or I = V/R 2. Power Formula (relationship between power used between, voltage across, and current through two points.): P = V I 3. Equivalent resistance : (a) For resistances hooked up in series:
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Unformatted text preview: R eq = R 1 + R 2 + R 3 + .... (b) For resistances hooked in parallel: 1 R eq = 1 R 1 + 1 R 2 + 1 R 3 + .... (Don’t forget to take the reciprocal to get R EQ . ok? ) 4. Transformer Equation : V P N P = V S N S where: V P , V S , N P , and N S are the voltages and number of turns in the primary and secondary coils. 1...
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