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8.3 Series and Parallel Circuits

8.3 Series and Parallel Circuits. In series circuits, current can only take one path. The amount of current is the same at all points in a series circuit. 20.1 Adding resistances in series. Each resistance in a series circuit adds to the total resistance of the circuit.

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8.3 Series and Parallel Circuits

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  1. 8.3 Series and Parallel Circuits • In series circuits, current can only take one path. • The amount of current is the same at all points in a series circuit.

  2. 20.1 Adding resistances in series • Each resistance in a series circuit adds to the total resistance of the circuit. Rtotal = R1 + R2 + R3... Total resistance (ohms) Individual resistances (W)

  3. Light bulbs, resistors, motors, and heaters usually have much greater resistance than wires and batteries. Total resistance in a series circuit

  4. How much current flows in a circuit with a 1.5-volt battery and three 1 ohm resistances (bulbs) in series? 20.1 Calculate current

  5. Each separate resistance creates a voltage drop as the current passes through. As current flows along a series circuit, each type of resistor transforms some of the electrical energy into another form of energy Ohm’s law is used to calculate the voltage drop across each resistor. 20.1 Voltage in a series circuit

  6. Parallel Circuits • In parallel circuits the current can take more than one path. • Because there are multiple branches, the current is not the same at all points in a parallel circuit.

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