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HWK35_11G(1)

# HWK35_11G(1) - I = V/R between points a and b in the...

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HWK 35 (Parallel Circuits) (due Monday 4/16/07) SAR Physics AM Kolchin Read chapter 35: sections 35.6 through 35.7 (pages 555-558) Answer questions: 11, 12, and 13. Do this worksheet . You must show your work using an equation and units in order to get full credit. Rules for Parallel Circuits : 1. In a parallel circuit, current divides to ﬂow through the diferent 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 three resistances. The resistances are: R 1 = 2 Ω R 2 = 2 Ω R 3 = 4 Ω A voltage of: V T = 120 V is maintained between points a and b. 2
1. Calculate R EQ for this circuit. (Hint: Apply rule 4) 1 /R EQ = R EQ = 2. Calculate the total current ( I T ) (Apply Ohm’s Law (

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Unformatted text preview: I = V/R ) between points a and b in the equivalent circuit ): I T = 3. Calculate the current ( I 1 ) through R 1 (Apply Ohm’s Law between points c and d ). I 1 = 4. Calculate the current ( I 2 ) through R 2 (Apply Ohm’s Law between points e and f ). I 2 = 5. Calculate the current ( I 3 ) through R 3 (Apply Ohm’s Law between points g and h ). I 3 = 6. Add the currents: I 1 + I 2 + I 3 = How does this sum compare to the total currrent I T , leaving the battery? 3 7. What is the total power drawn from the voltage source? (Hint: Use P = V I Units of power are watts .) P T = 8. What is the power used by R 1 ? P 1 = 9. What is the power used by R 2 ? P 2 = 10. What is the power used by R 3 ? P 3 = 11. Add the powers used by the three resistors together: P 1 + P 2 + P 3 = How does this sum compare to the total power ( P T ) drawn from the power source? 4...
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HWK35_11G(1) - I = V/R between points a and b in the...

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