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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 V I= R V2 P = R

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Energy (W) E = VIt E = P t E=I2Rt V2t E = 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**

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 = I1 = I2 = I3 = …

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**V = V1 + V2 + V3 +… 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 = V1 + V2 + V3 +…

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

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**Req = R1 + R2 + R3 + … SERIES CIRCUIT**

Req = equivalent resistance of the system Req = R1 + R2 + R3 + …

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SERIES CIRCUIT We can find: Req = I = VR1= VR2= VR3=

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SERIES CIRCUIT Req = = 12 kΩ I = V/R = 1 mA VR1= IR1 = 3 V VR2= IR2 = 4 V VR3= IR3 = 5 V

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Find: Req, I, VR1, VR2, VR3, VR4, VR5

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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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**1. What is the Req for this circuit? **

The accompanying circuit diagram represents four resistors connected to a 12-volt source. 1. What is the Req for this circuit? 2. What is the total current in the circuit? 3. What is the voltage across R1?

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