WS_Parallel

# WS_Parallel - V T = 120 V is maintained between points a...

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Worksheet for Parallel Circuits SAR Physics AM Kolchin Instructions 1. This worksheet is to be completed in class while work- ing together. Do not go ahead of the class. 2. Take notes in class on separate sheets of paper. 3. Calculations are to be done showing equations and units. Please don’t just write down numbers without expla- nation. No calculators are to be used unless explicitly stated. 4. The worksheet is to be handed in at the end of class even if it has not been completed. Parallel Circuits : 1. In a parallel circuit, current divides to flow through the different branches. The total current equals the sum of the currents in all of the branches. 2. The voltage drop across each resistor is the same. 3. Ohm’s Law ( V = IR or I = V/R ) can be applied between any two points in a circuit. 4. The resistances can be replaced by an ”equivalent resis- tance” that leaves the current unchanged. It is found as follows: 1 R EQ = 1 R 1 + 1 R 2 + 1 R 3 + .... 1

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Below is a parallel circuit with two resistances. The resistances are: R 1 = 6 Ω R 2 = 3 Ω A voltage of: V

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Unformatted text preview: V T = 120 V is maintained between points a and b. 2 1. Calculate R EQ for this circuit from the equation: Show your work using an equation and units. 1 R EQ = 1 R 1 + 1 R 2 = R EQ = 2. Calculate the total current ( I T ) by applying Ohm’s Law ( I = V/R ) between points a and b : I T = V T /R EQ = 3. Calculate the current ( I 1 ) through R 1 by applying Ohm’s Law between points c and d . I 1 = V T /R 1 = 4. Calculate the current ( I 2 ) through R 2 by applying Ohm’s Law between points e and f . I 2 = V T /R 2 = 5. Add the currents: I 1 + I 2 = How does this sum compare to the total currrent I T , leaving the battery? 3 6. What is the total power drawn from the voltage source? P T = V T I T = 7. What is the power used by R 1 ? P 1 = V T I 1 = 8. What is the power used by R 2 ? P 2 = V T I 2 = 9. Add the powers used by the two resistors together: P 1 + P 2 = How does this sum compare to the total power ( P T ) drawn from the power source? 4...
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