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Published byLola Wrightson Modified about 1 year ago

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Do Now: Calculate the resistance of the conductor whose graph is given above.

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Power & Energy in Electric Circuits Series Circuits

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Power in Electric Circuits Rate at which energy is supplied to circuit P = VI

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Example: Calculate the rate at which energy is supplied by a 120-volt source to a circuit if the current in the circuit is 5.5 amperes.

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P = VI I= V R P = V2V2 R

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Energy (W) E = P t E = VIt E=I 2 Rt E = V2tV2t R

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Example: How much energy is produced by a 50-volt source that generates a current of 5.0 amperes for 2.0 minutes?

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Example: An immersion heater has a resistance of 5.0 ohms while drawing a current of 3.0 amperes. How much electrical energy is delivered to the heater during 200. seconds of operation?

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An operating 100.-watt lamp is connected to a 120-volt outlet. What is the total electrical energy used by the lamp in 60. seconds?

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SERIES CIRCUIT Only ONE current path if that is interrupted, the entire circuit won’t work.

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SERIES CIRCUIT Since only one path, current throughout the circuit is constant I = I 1 = I 2 = I 3 = …

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SERIES CIRCUIT Potential difference (V) across 2 points depends on the work needed to get between those 2 points V drops across each resistor (not constant) V = V 1 + V 2 + V 3 +…

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SERIES CIRCUIT Ohm’s law holds for each resistance V = IR

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SERIES CIRCUIT R eq = equivalent resistance of the system R eq = R 1 + R 2 + R 3 + …

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SERIES CIRCUIT We can find: R eq = I = V R1 = V R2 = V R3 =

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SERIES CIRCUIT R eq = = 12 kΩ I = V/R = 1 mA V R1 = IR 1 = 3 V V R2 = IR 2 = 4 V V R3 = IR 3 = 5 V

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Find: R eq, I, V R1, V R2, V R3, V R4, V R5

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Page 650: 1-6 Complete each problem AND draw the circuit described in each question (except #6, no drawing necessary)

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EXIT QUIZ

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The accompanying circuit diagram represents four resistors connected to a 12-volt source. 1. What is the R eq for this circuit? 2. What is the total current in the circuit? 3. What is the voltage across R 1 ?

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