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Physics Circuits

Learn how to analyze series and parallel circuits step by step to solve for resistances, currents, voltages, and powers. Utilize rules for effective circuit analysis.

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Physics Circuits

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  1. Physics Circuits Circuit Practice

  2. Circuit 1 Series • Rules: • All series resistors (R) have the same current (I). • All parallel resistors (R) have the same voltage (V). • Solve for the most embedded circuit first. • Total power should equal the sum of the individual powers First, solve for total resistance by adding up the resistors. 6V Next, find the total values using V=IR. 10 10 22 42 1.43 1.43 3.14 6 0.14 0.14 0.14 0.14 0.21 0.21 0.44 0.86 Next, using the fact that all the resistors in series share the same current, put in the current values. Finally, solve all the other quantities using V=IR and P=IV. Check that the sum of power equals the total power.

  3. Circuit 2 Parallel • Rules: • All series resistors (R) have the same current (I). • All parallel resistors (R) have the same voltage (V). • Solve for the most embedded circuit first. • Total power should equal the sum of the individual powers Solve for total resistance using the product/sum. Rt = 1/(1/10+1/10+1/122) = 4.1Ω 6V Next, solve for all the total values using V=IR 10 10 22 4.1 6 6 6 6 0.6 0.6 0.27 1.47 3.6 3.6 1.6 8.8 Next: Using the fact that all resistors in a parallel get the same voltage, solve for all the other quantities. Finally, make sure the sum of powers equals the total power.

  4. Rules: • All series resistors (R) have the same current (I). • All parallel resistors (R) have the same voltage (V). • Solve for the most embedded circuit first. • Total power should equal the sum of the individual powers Circuit 3 Combination Solve Total Resistance First: Rt = Rseries + Rparallel Rt = 22Ω + (1/(1/40+1/20+1/10))Ω = 27.7Ω Next: Solve all total values (V,I,P). Finally, solve the rest of the values and check that the sum of power equals the total power. 10 20 40 22 27.7 1.25 1.25 1.25 4.8 6 0.125 0.062 0.031 0.216 0.216 0.156 0.079 0.039 1.05 1.32 Next: Draw the equivalent Circuit. Next: Solve all series values using the fact that all resistors in series have the same current and that V=IR. Rt=5.7Ω I=0.216A V=IR= 1.25V Next: Solve the parallel values using the fact that all the voltages are the same. Use I=V/R to solve currents.

  5. Rules: • All series resistors (R) have the same current (I). • All parallel resistors (R) have the same voltage (V). • Solve for the most embedded circuit first. • Total power should equal the sum of the individual powers Circuit 4 CombinationPractice! Solve resistance Solve totals, AND series values using V=IR and P=VI Solve embedded circuits, draw equivalent schematic, using the rules for parallel and series 10 10 40 40 22 32 1.875 1.875 3.75 3.75 8.25 12 0.1875 0.1875 0.094 0.094 0.375 0.375 0.35 0.35 0.353 0.353 3.01 4.5 Rt1=20Ω Solve everything else using V=IR and P=IV Rt2=10Ω Check your work! Power sum = Power Total It1=0.1875A Vt1= 3.75V It2=0.375A Vt2=IR= 3.75V

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