Series circuits
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Series Circuits. 8 Note Boxes. A Battery and a Bulb-Simple Circuits. Unsuccessful ways to light a bulb. . A Battery and a Bulb-Simple Circuits. Unsuccessful ways to light a bulb. Successful ways to light a bulb. Electrons Flow…. from the negative part of the battery through the wire

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Series Circuits

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Series circuits

Series Circuits

8 Note Boxes


Series circuits

A Battery and a Bulb-Simple Circuits

  • Unsuccessful ways to light a bulb.


Series circuits

A Battery and a Bulb-Simple Circuits

  • Unsuccessful ways to light a bulb.

  • Successful ways to light a bulb.


Series circuits

Electrons Flow…

  • from the negative part of the battery through the wire

  • to the side (or bottom) of the bulb

  • through the filament inside the bulb

  • out the bottom (or side)

  • through the wire to the positive part of the battery

  • The current then passes through the battery to complete the circuit.


  • Series circuits1

    Series Circuits

    Box #1-2 notes

    • In series circuits, current can only take one path.

    • The amount of current is the same at all points in a series circuit.


    Series circuits

    Series Circuits

    Box #2

    • The main disadvantage of a series circuit is that when one device fails, the current in the whole circuit stops.

    • Some cheap light strings are connected in series.

    • When one lamp burns out, you have to replace it or no lights work.


    Series circuits

    Voltage in a Series Circuit

    Box #3-2notes

    • Voltage: electrical potential; gives force to move electrons through a circuit

    • Voltage is linked to energy; to increase voltage you can use a stronger battery OR add batteries


    Series circuits

    • More voltage is like a stronger pump

    • Giving more force and more current

    • To find total voltage, you simply add each individual battery


    Series circuits

    Voltage-Potential Holders

    • Batteries are considered to contain potential energy; often called potential difference

    • Batteries give voltage: circuits use voltage

    • The voltage at the negative end of the batteries is always zero


    Series circuits

    Electrical Current

    Box #4-3 notes

    • Current: moving electrons; how easily electrons can move

    • Increasing electricity (voltage)=More current=Brighter lights!

    • Current is measured in amps (energy!) C-I-A


    Total resistance in a series circuit

    Light bulbs, motors, and wires create resistancein a circuit.

    Resistance: slows down the current

    The longer the wire or the more bulbs/motors, the more the resistance.

    Resistance is measured in Ohms

    Total resistance in a series circuit

    Box #5-4 notes


    Adding resistance

    Adding Resistance

    Box #6

    • Adding devices in a circuit increases resistance

    • More resistance=less current

    • Less current=less light


    Adding resistances in series

    Adding resistances in series

    • Each resistance in a series circuit adds to the total resistance of the circuit.

    Box #7

    Rtotal = R1 + R2 + R3...

    Total resistance

    (ohms)

    Individual resistances (W)


    Series circuits

    Ohms’s Law

    Box #8

    (Amps)

    (volts)

    (ohms)


    Voltage in a series circuit

    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.

    Voltage in a series circuit

    Box #6


    Objectives

    Objectives

    • Recognize and sketch examples of series circuits.

    • Calculate the current in a series circuit containing up to three resistances.

    • Calculate the total resistance of a circuit by combining series resistances

    • Design and construct series circuits


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