Regents Physics

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Regents Physics

• Chapters 17/18 Circuits
• Series Circuits

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The Series Circuit
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Summary 1. The sum of the potential drops equals
the potential rise of the source. 2. The
current is the same everywhere in the series
circuit 3. The total resistance of the circuit
(also called effective resistance) is equal
to the sum of the individual resistances
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Series Circuit and Ohms Law
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How it looks on your Reference Tables
What do these formulas tell us?
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Example of a Series Circuit
R1 2 ohms R2 3 ohms R3 1 ohm VB 12 V I
2.0 A Find Voltage drop at each resistor
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How Do We draw Circuits?

• A series circuit contains
• (1) 9 V cell and 5 ? (1) resistor.
• A voltmeter measures the voltage drop across the
  resistor.
• An ammeter measures the current flowing in the
  circuit.

1. Draw the Circuit
2. Calculate the current in the circuit
3. What is the voltage drop across the resistor?

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Series Circuits problem 2

• A series circuit contains a 12 V battery with 5?
  and 3? resistors in series.
• Draw the circuit
• What is the voltage drop across the resistors?
• What is the current flowing in the circuit?